text: /* ../netlib/ctgevc.f -- translated by f2c (version 20100827). You must link the resulting object file with libf2c: on Microsoft Windows system, link with libf2c.lib;
   on Linux or Unix systems, link with .../path/to/libf2c.a -lm or, if you install libf2c.a in a standard place, with -lf2c -lm -- in that order, at the end of the command line, as in cc *.o -lf2c -lm Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., http://www.netlib.org/f2c/libf2c.zip */
  #include "FLA_f2c.h" /* Table of constant values */
  static complex c_b1 =
  {
      0.f,0.f
  }
  ;
  static complex c_b2 =
  {
      1.f,0.f
  }
  ;
  static integer c__1 = 1;
  /* > \brief \b CTGEVC */
  /* =========== DOCUMENTATION =========== */
  /* Online html documentation available at */
  /* http://www.netlib.org/lapack/explore-html/ */
  /* > \htmlonly */
  /* > Download CTGEVC + dependencies */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/ctgevc. f"> */
  /* > [TGZ]</a> */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/ctgevc. f"> */
  /* > [ZIP]</a> */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/ctgevc. f"> */
  /* > [TXT]</a> */
  /* > \endhtmlonly */
  /* Definition: */
  /* =========== */
  /* SUBROUTINE CTGEVC( SIDE, HOWMNY, SELECT, N, S, LDS, P, LDP, VL, */
  /* LDVL, VR, LDVR, MM, M, WORK, RWORK, INFO ) */
  /* .. Scalar Arguments .. */
  /* CHARACTER HOWMNY, SIDE */
  /* INTEGER INFO, LDP, LDS, LDVL, LDVR, M, MM, N */
  /* .. */
  /* .. Array Arguments .. */
  /* LOGICAL SELECT( * ) */
  /* REAL RWORK( * ) */
  /* COMPLEX P( LDP, * ), S( LDS, * ), VL( LDVL, * ), */
  /* $ VR( LDVR, * ), WORK( * ) */
  /* .. */
  /* > \par Purpose: */
  /* ============= */
  /* > */
  /* > \verbatim */
  /* > */
  /* > CTGEVC computes some or all of the right and/or left eigenvectors of */
  /* > a pair of complex matrices (S,P), where S and P are upper triangular. */
  /* > Matrix pairs of this type are produced by the generalized Schur */
  /* > factorization of a complex matrix pair (A,B): */
  /* > */
  /* > A = Q*S*Z**H, B = Q*P*Z**H */
  /* > */
  /* > as computed by CGGHRD + CHGEQZ. */
  /* > */
  /* > The right eigenvector x and the left eigenvector y of (S,P) */
  /* > corresponding to an eigenvalue w are defined by: */
  /* > */
  /* > S*x = w*P*x, (y**H)*S = w*(y**H)*P, */
  /* > */
  /* > where y**H denotes the conjugate tranpose of y. */
  /* > The eigenvalues are not input to this routine, but are computed */
  /* > directly from the diagonal elements of S and P. */
  /* > */
  /* > This routine returns the matrices X and/or Y of right and left */
  /* > eigenvectors of (S,P), or the products Z*X and/or Q*Y, */
  /* > where Z and Q are input matrices. */
  /* > If Q and Z are the unitary factors from the generalized Schur */
  /* > factorization of a matrix pair (A,B), then Z*X and Q*Y */
  /* > are the matrices of right and left eigenvectors of (A,B). */
  /* > \endverbatim */
  /* Arguments: */
  /* ========== */
  /* > \param[in] SIDE */
  /* > \verbatim */
  /* > SIDE is CHARACTER*1 */
  /* > = 'R': compute right eigenvectors only;
  */
  /* > = 'L': compute left eigenvectors only;
  */
  /* > = 'B': compute both right and left eigenvectors. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] HOWMNY */
  /* > \verbatim */
  /* > HOWMNY is CHARACTER*1 */
  /* > = 'A': compute all right and/or left eigenvectors;
  */
  /* > = 'B': compute all right and/or left eigenvectors, */
  /* > backtransformed by the matrices in VR and/or VL;
  */
  /* > = 'S': compute selected right and/or left eigenvectors, */
  /* > specified by the logical array SELECT. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] SELECT */
  /* > \verbatim */
  /* > SELECT is LOGICAL array, dimension (N) */
  /* > If HOWMNY='S', SELECT specifies the eigenvectors to be */
  /* > computed. The eigenvector corresponding to the j-th */
  /* > eigenvalue is computed if SELECT(j) = .TRUE.. */
  /* > Not referenced if HOWMNY = 'A' or 'B'. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] N */
  /* > \verbatim */
  /* > N is INTEGER */
  /* > The order of the matrices S and P. N >= 0. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] S */
  /* > \verbatim */
  /* > S is COMPLEX array, dimension (LDS,N) */
  /* > The upper triangular matrix S from a generalized Schur */
  /* > factorization, as computed by CHGEQZ. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] LDS */
  /* > \verbatim */
  /* > LDS is INTEGER */
  /* > The leading dimension of array S. LDS >= max(1,N). */
  /* > \endverbatim */
  /* > */
  /* > \param[in] P */
  /* > \verbatim */
  /* > P is COMPLEX array, dimension (LDP,N) */
  /* > The upper triangular matrix P from a generalized Schur */
  /* > factorization, as computed by CHGEQZ. P must have real */
  /* > diagonal elements. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] LDP */
  /* > \verbatim */
  /* > LDP is INTEGER */
  /* > The leading dimension of array P. LDP >= max(1,N). */
  /* > \endverbatim */
  /* > */
  /* > \param[in,out] VL */
  /* > \verbatim */
  /* > VL is COMPLEX array, dimension (LDVL,MM) */
  /* > On entry, if SIDE = 'L' or 'B' and HOWMNY = 'B', VL must */
  /* > contain an N-by-N matrix Q (usually the unitary matrix Q */
  /* > of left Schur vectors returned by CHGEQZ). */
  /* > On exit, if SIDE = 'L' or 'B', VL contains: */
  /* > if HOWMNY = 'A', the matrix Y of left eigenvectors of (S,P);
  */
  /* > if HOWMNY = 'B', the matrix Q*Y;
  */
  /* > if HOWMNY = 'S', the left eigenvectors of (S,P) specified by */
  /* > SELECT, stored consecutively in the columns of */
  /* > VL, in the same order as their eigenvalues. */
  /* > Not referenced if SIDE = 'R'. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] LDVL */
  /* > \verbatim */
  /* > LDVL is INTEGER */
  /* > The leading dimension of array VL. LDVL >= 1, and if */
  /* > SIDE = 'L' or 'l' or 'B' or 'b', LDVL >= N. */
  /* > \endverbatim */
  /* > */
  /* > \param[in,out] VR */
  /* > \verbatim */
  /* > VR is COMPLEX array, dimension (LDVR,MM) */
  /* > On entry, if SIDE = 'R' or 'B' and HOWMNY = 'B', VR must */
  /* > contain an N-by-N matrix Q (usually the unitary matrix Z */
  /* > of right Schur vectors returned by CHGEQZ). */
  /* > On exit, if SIDE = 'R' or 'B', VR contains: */
  /* > if HOWMNY = 'A', the matrix X of right eigenvectors of (S,P);
  */
  /* > if HOWMNY = 'B', the matrix Z*X;
  */
  /* > if HOWMNY = 'S', the right eigenvectors of (S,P) specified by */
  /* > SELECT, stored consecutively in the columns of */
  /* > VR, in the same order as their eigenvalues. */
  /* > Not referenced if SIDE = 'L'. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] LDVR */
  /* > \verbatim */
  /* > LDVR is INTEGER */
  /* > The leading dimension of the array VR. LDVR >= 1, and if */
  /* > SIDE = 'R' or 'B', LDVR >= N. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] MM */
  /* > \verbatim */
  /* > MM is INTEGER */
  /* > The number of columns in the arrays VL and/or VR. MM >= M. */
  /* > \endverbatim */
  /* > */
  /* > \param[out] M */
  /* > \verbatim */
  /* > M is INTEGER */
  /* > The number of columns in the arrays VL and/or VR actually */
  /* > used to store the eigenvectors. If HOWMNY = 'A' or 'B', M */
  /* > is set to N. Each selected eigenvector occupies one column. */
  /* > \endverbatim */
  /* > */
  /* > \param[out] WORK */
  /* > \verbatim */
  /* > WORK is COMPLEX array, dimension (2*N) */
  /* > \endverbatim */
  /* > */
  /* > \param[out] RWORK */
  /* > \verbatim */
  /* > RWORK is REAL array, dimension (2*N) */
  /* > \endverbatim */
  /* > */
  /* > \param[out] INFO */
  /* > \verbatim */
  /* > INFO is INTEGER */
  /* > = 0: successful exit. */
  /* > < 0: if INFO = -i, the i-th argument had an illegal value. */
  /* > \endverbatim */
  /* Authors: */
  /* ======== */
  /* > \author Univ. of Tennessee */
  /* > \author Univ. of California Berkeley */
  /* > \author Univ. of Colorado Denver */
  /* > \author NAG Ltd. */
  /* > \date November 2011 */
  /* > \ingroup complexGEcomputational */
  /* ===================================================================== */
  /* Subroutine */
  int ctgevc_(char *side, char *howmny, logical *select, integer *n, complex *s, integer *lds, complex *p, integer *ldp, complex *vl, integer *ldvl, complex *vr, integer *ldvr, integer *mm, integer *m, complex *work, real *rwork, integer *info)
  {
      /* System generated locals */
      integer p_dim1, p_offset, s_dim1, s_offset, vl_dim1, vl_offset, vr_dim1, vr_offset, i__1, i__2, i__3, i__4, i__5;
      real r__1, r__2, r__3, r__4, r__5, r__6;
      complex q__1, q__2, q__3, q__4;
      /* Builtin functions */
      double r_imag(complex *);
      void r_cnjg(complex *, complex *);
      /* Local variables */
      complex d__;
      integer i__, j;
      complex ca, cb;
      integer je, im, jr;
      real big;
      logical lsa, lsb;
      real ulp;
      complex sum;
      integer ibeg, ieig, iend;
      real dmin__;
      integer isrc;
      real temp;
      complex suma, sumb;
      real xmax, scale;
      logical ilall;
      integer iside;
      real sbeta;
      extern logical lsame_(char *, char *);
      extern /* Subroutine */
      int cgemv_(char *, integer *, integer *, complex * , complex *, integer *, complex *, integer *, complex *, complex * , integer *);
      real small;
      logical compl;
      real anorm, bnorm;
      logical compr, ilbbad;
      real acoefa, bcoefa, acoeff;
      complex bcoeff;
      logical ilback;
      extern /* Subroutine */
      int slabad_(real *, real *);
      real ascale, bscale;
      extern /* Complex */
      VOID cladiv_(complex *, complex *, complex *);
      extern real slamch_(char *);
      complex salpha;
      real safmin;
      extern /* Subroutine */
      int xerbla_(char *, integer *);
      real bignum;
      logical ilcomp;
      integer ihwmny;
      /* -- LAPACK computational routine (version 3.4.0) -- */
      /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
      /* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
      /* November 2011 */
      /* .. Scalar Arguments .. */
      /* .. */
      /* .. Array Arguments .. */
      /* .. */
      /* ===================================================================== */
      /* .. Parameters .. */
      /* .. */
      /* .. Local Scalars .. */
      /* .. */
      /* .. External Functions .. */
      /* .. */
      /* .. External Subroutines .. */
      /* .. */
      /* .. Intrinsic Functions .. */
      /* .. */
      /* .. Statement Functions .. */
      /* .. */
      /* .. Statement Function definitions .. */
      /* .. */
      /* .. Executable Statements .. */
      /* Decode and Test the input parameters */
      /* Parameter adjustments */
      --select;
      s_dim1 = *lds;
      s_offset = 1 + s_dim1;
      s -= s_offset;
      p_dim1 = *ldp;
      p_offset = 1 + p_dim1;
      p -= p_offset;
      vl_dim1 = *ldvl;
      vl_offset = 1 + vl_dim1;
      vl -= vl_offset;
      vr_dim1 = *ldvr;
      vr_offset = 1 + vr_dim1;
      vr -= vr_offset;
      --work;
      --rwork;
      /* Function Body */
      if (lsame_(howmny, "A"))
      {
          ihwmny = 1;
          ilall = TRUE_;
          ilback = FALSE_;
      }
      else if (lsame_(howmny, "S"))
      {
          ihwmny = 2;
          ilall = FALSE_;
          ilback = FALSE_;
      }
      else if (lsame_(howmny, "B"))
      {
          ihwmny = 3;
          ilall = TRUE_;
          ilback = TRUE_;
      }
      else
      {
          ihwmny = -1;
      }
      if (lsame_(side, "R"))
      {
          iside = 1;
          compl = FALSE_;
          compr = TRUE_;
      }
      else if (lsame_(side, "L"))
      {
          iside = 2;
          compl = TRUE_;
          compr = FALSE_;
      }
      else if (lsame_(side, "B"))
      {
          iside = 3;
          compl = TRUE_;
          compr = TRUE_;
      }
      else
      {
          iside = -1;
      }
      *info = 0;
      if (iside < 0)
      {
          *info = -1;
      }
      else if (ihwmny < 0)
      {
          *info = -2;
      }
      else if (*n < 0)
      {
          *info = -4;
      }
      else if (*lds < max(1,*n))
      {
          *info = -6;
      }
      else if (*ldp < max(1,*n))
      {
          *info = -8;
      }
      if (*info != 0)
      {
          i__1 = -(*info);
          xerbla_("CTGEVC", &i__1);
          return 0;
      }
      /* Count the number of eigenvectors */
      if (! ilall)
      {
          im = 0;
          i__1 = *n;
          for (j = 1;
                  j <= i__1;
                  ++j)
          {
              if (select[j])
              {
                  ++im;
              }
              /* L10: */
          }
      }
      else
      {
          im = *n;
      }
      /* Check diagonal of B */
      ilbbad = FALSE_;
      i__1 = *n;
      for (j = 1;
              j <= i__1;
              ++j)
      {
          if (r_imag(&p[j + j * p_dim1]) != 0.f)
          {
              ilbbad = TRUE_;
          }
          /* L20: */
      }
      if (ilbbad)
      {
          *info = -7;
      }
      else if (compl && *ldvl < *n || *ldvl < 1)
      {
          *info = -10;
      }
      else if (compr && *ldvr < *n || *ldvr < 1)
      {
          *info = -12;
      }
      else if (*mm < im)
      {
          *info = -13;
      }
      if (*info != 0)
      {
          i__1 = -(*info);
          xerbla_("CTGEVC", &i__1);
          return 0;
      }
      /* Quick return if possible */
      *m = im;
      if (*n == 0)
      {
          return 0;
      }
      /* Machine Constants */
      safmin = slamch_("Safe minimum");
      big = 1.f / safmin;
      slabad_(&safmin, &big);
      ulp = slamch_("Epsilon") * slamch_("Base");
      small = safmin * *n / ulp;
      big = 1.f / small;
      bignum = 1.f / (safmin * *n);
      /* Compute the 1-norm of each column of the strictly upper triangular */
      /* part of A and B to check for possible overflow in the triangular */
      /* solver. */
      i__1 = s_dim1 + 1;
      anorm = (r__1 = s[i__1].r, f2c_abs(r__1)) + (r__2 = r_imag(&s[s_dim1 + 1]), f2c_abs(r__2));
      i__1 = p_dim1 + 1;
      bnorm = (r__1 = p[i__1].r, f2c_abs(r__1)) + (r__2 = r_imag(&p[p_dim1 + 1]), f2c_abs(r__2));
      rwork[1] = 0.f;
      rwork[*n + 1] = 0.f;
      i__1 = *n;
      for (j = 2;
              j <= i__1;
              ++j)
      {
          rwork[j] = 0.f;
          rwork[*n + j] = 0.f;
          i__2 = j - 1;
          for (i__ = 1;
                  i__ <= i__2;
                  ++i__)
          {
              i__3 = i__ + j * s_dim1;
              rwork[j] += (r__1 = s[i__3].r, f2c_abs(r__1)) + (r__2 = r_imag(&s[i__ + j * s_dim1]), f2c_abs(r__2));
              i__3 = i__ + j * p_dim1;
              rwork[*n + j] += (r__1 = p[i__3].r, f2c_abs(r__1)) + (r__2 = r_imag(& p[i__ + j * p_dim1]), f2c_abs(r__2));
              /* L30: */
          }
          /* Computing MAX */
          i__2 = j + j * s_dim1;
          r__3 = anorm;
          r__4 = rwork[j] + ((r__1 = s[i__2].r, f2c_abs(r__1)) + ( r__2 = r_imag(&s[j + j * s_dim1]), f2c_abs(r__2))); // , expr subst
          anorm = max(r__3,r__4);
          /* Computing MAX */
          i__2 = j + j * p_dim1;
          r__3 = bnorm;
          r__4 = rwork[*n + j] + ((r__1 = p[i__2].r, f2c_abs(r__1)) + (r__2 = r_imag(&p[j + j * p_dim1]), f2c_abs(r__2))); // , expr subst
          bnorm = max(r__3,r__4);
          /* L40: */
      }
      ascale = 1.f / max(anorm,safmin);
      bscale = 1.f / max(bnorm,safmin);
      /* Left eigenvectors */
      if (compl)
      {
          ieig = 0;
          /* Main loop over eigenvalues */
          i__1 = *n;
          for (je = 1;
                  je <= i__1;
                  ++je)
          {
              if (ilall)
              {
                  ilcomp = TRUE_;
              }
              else
              {
                  ilcomp = select[je];
              }
              if (ilcomp)
              {
                  ++ieig;
                  i__2 = je + je * s_dim1;
                  i__3 = je + je * p_dim1;
                  if ((r__2 = s[i__2].r, f2c_abs(r__2)) + (r__3 = r_imag(&s[je + je * s_dim1]), f2c_abs(r__3)) <= safmin && (r__1 = p[i__3].r, f2c_abs(r__1)) <= safmin)
                  {
                      /* Singular matrix pencil -- return unit eigenvector */
                      i__2 = *n;
                      for (jr = 1;
                              jr <= i__2;
                              ++jr)
                      {
                          i__3 = jr + ieig * vl_dim1;
                          vl[i__3].r = 0.f;
                          vl[i__3].i = 0.f; // , expr subst
                          /* L50: */
                      }
                      i__2 = ieig + ieig * vl_dim1;
                      vl[i__2].r = 1.f;
                      vl[i__2].i = 0.f; // , expr subst
                      goto L140;
                  }
                  /* Non-singular eigenvalue: */
                  /* Compute coefficients a and b in */
                  /* H */
                  /* y ( a A - b B ) = 0 */
                  /* Computing MAX */
                  i__2 = je + je * s_dim1;
                  i__3 = je + je * p_dim1;
                  r__4 = ((r__2 = s[i__2].r, f2c_abs(r__2)) + (r__3 = r_imag(&s[je + je * s_dim1]), f2c_abs(r__3))) * ascale;
                  r__5 = (r__1 = p[i__3].r, f2c_abs(r__1)) * bscale;
                  r__4 = max(r__4,r__5); // ; expr subst
                  temp = 1.f / max(r__4,safmin);
                  i__2 = je + je * s_dim1;
                  q__2.r = temp * s[i__2].r;
                  q__2.i = temp * s[i__2].i; // , expr subst
                  q__1.r = ascale * q__2.r;
                  q__1.i = ascale * q__2.i; // , expr subst
                  salpha.r = q__1.r;
                  salpha.i = q__1.i; // , expr subst
                  i__2 = je + je * p_dim1;
                  sbeta = temp * p[i__2].r * bscale;
                  acoeff = sbeta * ascale;
                  q__1.r = bscale * salpha.r;
                  q__1.i = bscale * salpha.i; // , expr subst
                  bcoeff.r = q__1.r;
                  bcoeff.i = q__1.i; // , expr subst
                  /* Scale to avoid underflow */
                  lsa = f2c_abs(sbeta) >= safmin && f2c_abs(acoeff) < small;
                  lsb = (r__1 = salpha.r, f2c_abs(r__1)) + (r__2 = r_imag(&salpha), f2c_abs(r__2)) >= safmin && (r__3 = bcoeff.r, f2c_abs(r__3)) + (r__4 = r_imag(&bcoeff), f2c_abs(r__4)) < small;
                  scale = 1.f;
                  if (lsa)
                  {
                      scale = small / f2c_abs(sbeta) * min(anorm,big);
                  }
                  if (lsb)
                  {
                      /* Computing MAX */
                      r__3 = scale;
                      r__4 = small / ((r__1 = salpha.r, f2c_abs(r__1)) + (r__2 = r_imag(&salpha), f2c_abs(r__2))) * min( bnorm,big); // , expr subst
                      scale = max(r__3,r__4);
                  }
                  if (lsa || lsb)
                  {
                      /* Computing MIN */
                      /* Computing MAX */
                      r__5 = 1.f, r__6 = f2c_abs(acoeff);
                      r__5 = max(r__5,r__6);
                      r__6 = (r__1 = bcoeff.r, f2c_abs(r__1)) + (r__2 = r_imag(&bcoeff), f2c_abs(r__2)); // ; expr subst
                      r__3 = scale;
                      r__4 = 1.f / (safmin * max(r__5,r__6)); // , expr subst
                      scale = min(r__3,r__4);
                      if (lsa)
                      {
                          acoeff = ascale * (scale * sbeta);
                      }
                      else
                      {
                          acoeff = scale * acoeff;
                      }
                      if (lsb)
                      {
                          q__2.r = scale * salpha.r;
                          q__2.i = scale * salpha.i; // , expr subst
                          q__1.r = bscale * q__2.r;
                          q__1.i = bscale * q__2.i; // , expr subst
                          bcoeff.r = q__1.r;
                          bcoeff.i = q__1.i; // , expr subst
                      }
                      else
                      {
                          q__1.r = scale * bcoeff.r;
                          q__1.i = scale * bcoeff.i; // , expr subst
                          bcoeff.r = q__1.r;
                          bcoeff.i = q__1.i; // , expr subst
                      }
                  }
                  acoefa = f2c_abs(acoeff);
                  bcoefa = (r__1 = bcoeff.r, f2c_abs(r__1)) + (r__2 = r_imag(& bcoeff), f2c_abs(r__2));
                  xmax = 1.f;
                  i__2 = *n;
                  for (jr = 1;
                          jr <= i__2;
                          ++jr)
                  {
                      i__3 = jr;
                      work[i__3].r = 0.f;
                      work[i__3].i = 0.f; // , expr subst
                      /* L60: */
                  }
                  i__2 = je;
                  work[i__2].r = 1.f;
                  work[i__2].i = 0.f; // , expr subst
                  /* Computing MAX */
                  r__1 = ulp * acoefa * anorm;
                  r__2 = ulp * bcoefa * bnorm;
                  r__1 = max(r__1,r__2); // ; expr subst
                  dmin__ = max(r__1,safmin);
                  /* H */
                  /* Triangular solve of (a A - b B) y = 0 */
                  /* H */
                  /* (rowwise in (a A - b B) , or columnwise in a A - b B) */
                  i__2 = *n;
                  for (j = je + 1;
                          j <= i__2;
                          ++j)
                  {
                      /* Compute */
                      /* j-1 */
                      /* SUM = sum conjg( a*S(k,j) - b*P(k,j) )*x(k) */
                      /* k=je */
                      /* (Scale if necessary) */
                      temp = 1.f / xmax;
                      if (acoefa * rwork[j] + bcoefa * rwork[*n + j] > bignum * temp)
                      {
                          i__3 = j - 1;
                          for (jr = je;
                                  jr <= i__3;
                                  ++jr)
                          {
                              i__4 = jr;
                              i__5 = jr;
                              q__1.r = temp * work[i__5].r;
                              q__1.i = temp * work[i__5].i; // , expr subst
                              work[i__4].r = q__1.r;
                              work[i__4].i = q__1.i; // , expr subst
                              /* L70: */
                          }
                          xmax = 1.f;
                      }
                      suma.r = 0.f;
                      suma.i = 0.f; // , expr subst
                      sumb.r = 0.f;
                      sumb.i = 0.f; // , expr subst
                      i__3 = j - 1;
                      for (jr = je;
                              jr <= i__3;
                              ++jr)
                      {
                          r_cnjg(&q__3, &s[jr + j * s_dim1]);
                          i__4 = jr;
                          q__2.r = q__3.r * work[i__4].r - q__3.i * work[i__4] .i;
                          q__2.i = q__3.r * work[i__4].i + q__3.i * work[i__4].r; // , expr subst
                          q__1.r = suma.r + q__2.r;
                          q__1.i = suma.i + q__2.i; // , expr subst
                          suma.r = q__1.r;
                          suma.i = q__1.i; // , expr subst
                          r_cnjg(&q__3, &p[jr + j * p_dim1]);
                          i__4 = jr;
                          q__2.r = q__3.r * work[i__4].r - q__3.i * work[i__4] .i;
                          q__2.i = q__3.r * work[i__4].i + q__3.i * work[i__4].r; // , expr subst
                          q__1.r = sumb.r + q__2.r;
                          q__1.i = sumb.i + q__2.i; // , expr subst
                          sumb.r = q__1.r;
                          sumb.i = q__1.i; // , expr subst
                          /* L80: */
                      }
                      q__2.r = acoeff * suma.r;
                      q__2.i = acoeff * suma.i; // , expr subst
                      r_cnjg(&q__4, &bcoeff);
                      q__3.r = q__4.r * sumb.r - q__4.i * sumb.i;
                      q__3.i = q__4.r * sumb.i + q__4.i * sumb.r; // , expr subst
                      q__1.r = q__2.r - q__3.r;
                      q__1.i = q__2.i - q__3.i; // , expr subst
                      sum.r = q__1.r;
                      sum.i = q__1.i; // , expr subst
                      /* Form x(j) = - SUM / conjg( a*S(j,j) - b*P(j,j) ) */
                      /* with scaling and perturbation of the denominator */
                      i__3 = j + j * s_dim1;
                      q__3.r = acoeff * s[i__3].r;
                      q__3.i = acoeff * s[i__3].i; // , expr subst
                      i__4 = j + j * p_dim1;
                      q__4.r = bcoeff.r * p[i__4].r - bcoeff.i * p[i__4].i;
                      q__4.i = bcoeff.r * p[i__4].i + bcoeff.i * p[i__4] .r; // , expr subst
                      q__2.r = q__3.r - q__4.r;
                      q__2.i = q__3.i - q__4.i; // , expr subst
                      r_cnjg(&q__1, &q__2);
                      d__.r = q__1.r;
                      d__.i = q__1.i; // , expr subst
                      if ((r__1 = d__.r, f2c_abs(r__1)) + (r__2 = r_imag(&d__), f2c_abs( r__2)) <= dmin__)
                      {
                          q__1.r = dmin__;
                          q__1.i = 0.f; // , expr subst
                          d__.r = q__1.r;
                          d__.i = q__1.i; // , expr subst
                      }
                      if ((r__1 = d__.r, f2c_abs(r__1)) + (r__2 = r_imag(&d__), f2c_abs( r__2)) < 1.f)
                      {
                          if ((r__1 = sum.r, f2c_abs(r__1)) + (r__2 = r_imag(&sum), f2c_abs(r__2)) >= bignum * ((r__3 = d__.r, f2c_abs( r__3)) + (r__4 = r_imag(&d__), f2c_abs(r__4))))
                          {
                              temp = 1.f / ((r__1 = sum.r, f2c_abs(r__1)) + (r__2 = r_imag(&sum), f2c_abs(r__2)));
                              i__3 = j - 1;
                              for (jr = je;
                                      jr <= i__3;
                                      ++jr)
                              {
                                  i__4 = jr;
                                  i__5 = jr;
                                  q__1.r = temp * work[i__5].r;
                                  q__1.i = temp * work[i__5].i; // , expr subst
                                  work[i__4].r = q__1.r;
                                  work[i__4].i = q__1.i; // , expr subst
                                  /* L90: */
                              }
                              xmax = temp * xmax;
                              q__1.r = temp * sum.r;
                              q__1.i = temp * sum.i; // , expr subst
                              sum.r = q__1.r;
                              sum.i = q__1.i; // , expr subst
                          }
                      }
                      i__3 = j;
                      q__2.r = -sum.r;
                      q__2.i = -sum.i; // , expr subst
                      cladiv_(&q__1, &q__2, &d__);
                      work[i__3].r = q__1.r;
                      work[i__3].i = q__1.i; // , expr subst
                      /* Computing MAX */
                      i__3 = j;
                      r__3 = xmax;
                      r__4 = (r__1 = work[i__3].r, f2c_abs(r__1)) + ( r__2 = r_imag(&work[j]), f2c_abs(r__2)); // , expr subst
                      xmax = max(r__3,r__4);
                      /* L100: */
                  }
                  /* Back transform eigenvector if HOWMNY='B'. */
                  if (ilback)
                  {
                      i__2 = *n + 1 - je;
                      cgemv_("N", n, &i__2, &c_b2, &vl[je * vl_dim1 + 1], ldvl, &work[je], &c__1, &c_b1, &work[*n + 1], &c__1);
                      isrc = 2;
                      ibeg = 1;
                  }
                  else
                  {
                      isrc = 1;
                      ibeg = je;
                  }
                  /* Copy and scale eigenvector into column of VL */
                  xmax = 0.f;
                  i__2 = *n;
                  for (jr = ibeg;
                          jr <= i__2;
                          ++jr)
                  {
                      /* Computing MAX */
                      i__3 = (isrc - 1) * *n + jr;
                      r__3 = xmax;
                      r__4 = (r__1 = work[i__3].r, f2c_abs(r__1)) + ( r__2 = r_imag(&work[(isrc - 1) * *n + jr]), f2c_abs( r__2)); // , expr subst
                      xmax = max(r__3,r__4);
                      /* L110: */
                  }
                  if (xmax > safmin)
                  {
                      temp = 1.f / xmax;
                      i__2 = *n;
                      for (jr = ibeg;
                              jr <= i__2;
                              ++jr)
                      {
                          i__3 = jr + ieig * vl_dim1;
                          i__4 = (isrc - 1) * *n + jr;
                          q__1.r = temp * work[i__4].r;
                          q__1.i = temp * work[ i__4].i; // , expr subst
                          vl[i__3].r = q__1.r;
                          vl[i__3].i = q__1.i; // , expr subst
                          /* L120: */
                      }
                  }
                  else
                  {
                      ibeg = *n + 1;
                  }
                  i__2 = ibeg - 1;
                  for (jr = 1;
                          jr <= i__2;
                          ++jr)
                  {
                      i__3 = jr + ieig * vl_dim1;
                      vl[i__3].r = 0.f;
                      vl[i__3].i = 0.f; // , expr subst
                      /* L130: */
                  }
              }
  L140:
              ;
          }
      }
      /* Right eigenvectors */
      if (compr)
      {
          ieig = im + 1;
          /* Main loop over eigenvalues */
          for (je = *n;
                  je >= 1;
                  --je)
          {
              if (ilall)
              {
                  ilcomp = TRUE_;
              }
              else
              {
                  ilcomp = select[je];
              }
              if (ilcomp)
              {
                  --ieig;
                  i__1 = je + je * s_dim1;
                  i__2 = je + je * p_dim1;
                  if ((r__2 = s[i__1].r, f2c_abs(r__2)) + (r__3 = r_imag(&s[je + je * s_dim1]), f2c_abs(r__3)) <= safmin && (r__1 = p[i__2].r, f2c_abs(r__1)) <= safmin)
                  {
                      /* Singular matrix pencil -- return unit eigenvector */
                      i__1 = *n;
                      for (jr = 1;
                              jr <= i__1;
                              ++jr)
                      {
                          i__2 = jr + ieig * vr_dim1;
                          vr[i__2].r = 0.f;
                          vr[i__2].i = 0.f; // , expr subst
                          /* L150: */
                      }
                      i__1 = ieig + ieig * vr_dim1;
                      vr[i__1].r = 1.f;
                      vr[i__1].i = 0.f; // , expr subst
                      goto L250;
                  }
                  /* Non-singular eigenvalue: */
                  /* Compute coefficients a and b in */
                  /* ( a A - b B ) x = 0 */
                  /* Computing MAX */
                  i__1 = je + je * s_dim1;
                  i__2 = je + je * p_dim1;
                  r__4 = ((r__2 = s[i__1].r, f2c_abs(r__2)) + (r__3 = r_imag(&s[je + je * s_dim1]), f2c_abs(r__3))) * ascale;
                  r__5 = (r__1 = p[i__2].r, f2c_abs(r__1)) * bscale;
                  r__4 = max(r__4,r__5); // ; expr subst
                  temp = 1.f / max(r__4,safmin);
                  i__1 = je + je * s_dim1;
                  q__2.r = temp * s[i__1].r;
                  q__2.i = temp * s[i__1].i; // , expr subst
                  q__1.r = ascale * q__2.r;
                  q__1.i = ascale * q__2.i; // , expr subst
                  salpha.r = q__1.r;
                  salpha.i = q__1.i; // , expr subst
                  i__1 = je + je * p_dim1;
                  sbeta = temp * p[i__1].r * bscale;
                  acoeff = sbeta * ascale;
                  q__1.r = bscale * salpha.r;
                  q__1.i = bscale * salpha.i; // , expr subst
                  bcoeff.r = q__1.r;
                  bcoeff.i = q__1.i; // , expr subst
                  /* Scale to avoid underflow */
                  lsa = f2c_abs(sbeta) >= safmin && f2c_abs(acoeff) < small;
                  lsb = (r__1 = salpha.r, f2c_abs(r__1)) + (r__2 = r_imag(&salpha), f2c_abs(r__2)) >= safmin && (r__3 = bcoeff.r, f2c_abs(r__3)) + (r__4 = r_imag(&bcoeff), f2c_abs(r__4)) < small;
                  scale = 1.f;
                  if (lsa)
                  {
                      scale = small / f2c_abs(sbeta) * min(anorm,big);
                  }
                  if (lsb)
                  {
                      /* Computing MAX */
                      r__3 = scale;
                      r__4 = small / ((r__1 = salpha.r, f2c_abs(r__1)) + (r__2 = r_imag(&salpha), f2c_abs(r__2))) * min( bnorm,big); // , expr subst
                      scale = max(r__3,r__4);
                  }
                  if (lsa || lsb)
                  {
                      /* Computing MIN */
                      /* Computing MAX */
                      r__5 = 1.f, r__6 = f2c_abs(acoeff);
                      r__5 = max(r__5,r__6);
                      r__6 = (r__1 = bcoeff.r, f2c_abs(r__1)) + (r__2 = r_imag(&bcoeff), f2c_abs(r__2)); // ; expr subst
                      r__3 = scale;
                      r__4 = 1.f / (safmin * max(r__5,r__6)); // , expr subst
                      scale = min(r__3,r__4);
                      if (lsa)
                      {
                          acoeff = ascale * (scale * sbeta);
                      }
                      else
                      {
                          acoeff = scale * acoeff;
                      }
                      if (lsb)
                      {
                          q__2.r = scale * salpha.r;
                          q__2.i = scale * salpha.i; // , expr subst
                          q__1.r = bscale * q__2.r;
                          q__1.i = bscale * q__2.i; // , expr subst
                          bcoeff.r = q__1.r;
                          bcoeff.i = q__1.i; // , expr subst
                      }
                      else
                      {
                          q__1.r = scale * bcoeff.r;
                          q__1.i = scale * bcoeff.i; // , expr subst
                          bcoeff.r = q__1.r;
                          bcoeff.i = q__1.i; // , expr subst
                      }
                  }
                  acoefa = f2c_abs(acoeff);
                  bcoefa = (r__1 = bcoeff.r, f2c_abs(r__1)) + (r__2 = r_imag(& bcoeff), f2c_abs(r__2));
                  xmax = 1.f;
                  i__1 = *n;
                  for (jr = 1;
                          jr <= i__1;
                          ++jr)
                  {
                      i__2 = jr;
                      work[i__2].r = 0.f;
                      work[i__2].i = 0.f; // , expr subst
                      /* L160: */
                  }
                  i__1 = je;
                  work[i__1].r = 1.f;
                  work[i__1].i = 0.f; // , expr subst
                  /* Computing MAX */
                  r__1 = ulp * acoefa * anorm;
                  r__2 = ulp * bcoefa * bnorm;
                  r__1 = max(r__1,r__2); // ; expr subst
                  dmin__ = max(r__1,safmin);
                  /* Triangular solve of (a A - b B) x = 0 (columnwise) */
                  /* WORK(1:j-1) contains sums w, */
                  /* WORK(j+1:JE) contains x */
                  i__1 = je - 1;
                  for (jr = 1;
                          jr <= i__1;
                          ++jr)
                  {
                      i__2 = jr;
                      i__3 = jr + je * s_dim1;
                      q__2.r = acoeff * s[i__3].r;
                      q__2.i = acoeff * s[i__3].i; // , expr subst
                      i__4 = jr + je * p_dim1;
                      q__3.r = bcoeff.r * p[i__4].r - bcoeff.i * p[i__4].i;
                      q__3.i = bcoeff.r * p[i__4].i + bcoeff.i * p[i__4] .r; // , expr subst
                      q__1.r = q__2.r - q__3.r;
                      q__1.i = q__2.i - q__3.i; // , expr subst
                      work[i__2].r = q__1.r;
                      work[i__2].i = q__1.i; // , expr subst
                      /* L170: */
                  }
                  i__1 = je;
                  work[i__1].r = 1.f;
                  work[i__1].i = 0.f; // , expr subst
                  for (j = je - 1;
                          j >= 1;
                          --j)
                  {
                      /* Form x(j) := - w(j) / d */
                      /* with scaling and perturbation of the denominator */
                      i__1 = j + j * s_dim1;
                      q__2.r = acoeff * s[i__1].r;
                      q__2.i = acoeff * s[i__1].i; // , expr subst
                      i__2 = j + j * p_dim1;
                      q__3.r = bcoeff.r * p[i__2].r - bcoeff.i * p[i__2].i;
                      q__3.i = bcoeff.r * p[i__2].i + bcoeff.i * p[i__2] .r; // , expr subst
                      q__1.r = q__2.r - q__3.r;
                      q__1.i = q__2.i - q__3.i; // , expr subst
                      d__.r = q__1.r;
                      d__.i = q__1.i; // , expr subst
                      if ((r__1 = d__.r, f2c_abs(r__1)) + (r__2 = r_imag(&d__), f2c_abs( r__2)) <= dmin__)
                      {
                          q__1.r = dmin__;
                          q__1.i = 0.f; // , expr subst
                          d__.r = q__1.r;
                          d__.i = q__1.i; // , expr subst
                      }
                      if ((r__1 = d__.r, f2c_abs(r__1)) + (r__2 = r_imag(&d__), f2c_abs( r__2)) < 1.f)
                      {
                          i__1 = j;
                          if ((r__1 = work[i__1].r, f2c_abs(r__1)) + (r__2 = r_imag( &work[j]), f2c_abs(r__2)) >= bignum * ((r__3 = d__.r, f2c_abs(r__3)) + (r__4 = r_imag(&d__), f2c_abs( r__4))))
                          {
                              i__1 = j;
                              temp = 1.f / ((r__1 = work[i__1].r, f2c_abs(r__1)) + ( r__2 = r_imag(&work[j]), f2c_abs(r__2)));
                              i__1 = je;
                              for (jr = 1;
                                      jr <= i__1;
                                      ++jr)
                              {
                                  i__2 = jr;
                                  i__3 = jr;
                                  q__1.r = temp * work[i__3].r;
                                  q__1.i = temp * work[i__3].i; // , expr subst
                                  work[i__2].r = q__1.r;
                                  work[i__2].i = q__1.i; // , expr subst
                                  /* L180: */
                              }
                          }
                      }
                      i__1 = j;
                      i__2 = j;
                      q__2.r = -work[i__2].r;
                      q__2.i = -work[i__2].i; // , expr subst
                      cladiv_(&q__1, &q__2, &d__);
                      work[i__1].r = q__1.r;
                      work[i__1].i = q__1.i; // , expr subst
                      if (j > 1)
                      {
                          /* w = w + x(j)*(a S(*,j) - b P(*,j) ) with scaling */
                          i__1 = j;
                          if ((r__1 = work[i__1].r, f2c_abs(r__1)) + (r__2 = r_imag( &work[j]), f2c_abs(r__2)) > 1.f)
                          {
                              i__1 = j;
                              temp = 1.f / ((r__1 = work[i__1].r, f2c_abs(r__1)) + ( r__2 = r_imag(&work[j]), f2c_abs(r__2)));
                              if (acoefa * rwork[j] + bcoefa * rwork[*n + j] >= bignum * temp)
                              {
                                  i__1 = je;
                                  for (jr = 1;
                                          jr <= i__1;
                                          ++jr)
                                  {
                                      i__2 = jr;
                                      i__3 = jr;
                                      q__1.r = temp * work[i__3].r;
                                      q__1.i = temp * work[i__3].i; // , expr subst
                                      work[i__2].r = q__1.r;
                                      work[i__2].i = q__1.i; // , expr subst
                                      /* L190: */
                                  }
                              }
                          }
                          i__1 = j;
                          q__1.r = acoeff * work[i__1].r;
                          q__1.i = acoeff * work[i__1].i; // , expr subst
                          ca.r = q__1.r;
                          ca.i = q__1.i; // , expr subst
                          i__1 = j;
                          q__1.r = bcoeff.r * work[i__1].r - bcoeff.i * work[ i__1].i;
                          q__1.i = bcoeff.r * work[i__1].i + bcoeff.i * work[i__1].r; // , expr subst
                          cb.r = q__1.r;
                          cb.i = q__1.i; // , expr subst
                          i__1 = j - 1;
                          for (jr = 1;
                                  jr <= i__1;
                                  ++jr)
                          {
                              i__2 = jr;
                              i__3 = jr;
                              i__4 = jr + j * s_dim1;
                              q__3.r = ca.r * s[i__4].r - ca.i * s[i__4].i;
                              q__3.i = ca.r * s[i__4].i + ca.i * s[i__4] .r; // , expr subst
                              q__2.r = work[i__3].r + q__3.r;
                              q__2.i = work[ i__3].i + q__3.i; // , expr subst
                              i__5 = jr + j * p_dim1;
                              q__4.r = cb.r * p[i__5].r - cb.i * p[i__5].i;
                              q__4.i = cb.r * p[i__5].i + cb.i * p[i__5] .r; // , expr subst
                              q__1.r = q__2.r - q__4.r;
                              q__1.i = q__2.i - q__4.i; // , expr subst
                              work[i__2].r = q__1.r;
                              work[i__2].i = q__1.i; // , expr subst
                              /* L200: */
                          }
                      }
                      /* L210: */
                  }
                  /* Back transform eigenvector if HOWMNY='B'. */
                  if (ilback)
                  {
                      cgemv_("N", n, &je, &c_b2, &vr[vr_offset], ldvr, &work[1], &c__1, &c_b1, &work[*n + 1], &c__1);
                      isrc = 2;
                      iend = *n;
                  }
                  else
                  {
                      isrc = 1;
                      iend = je;
                  }
                  /* Copy and scale eigenvector into column of VR */
                  xmax = 0.f;
                  i__1 = iend;
                  for (jr = 1;
                          jr <= i__1;
                          ++jr)
                  {
                      /* Computing MAX */
                      i__2 = (isrc - 1) * *n + jr;
                      r__3 = xmax;
                      r__4 = (r__1 = work[i__2].r, f2c_abs(r__1)) + ( r__2 = r_imag(&work[(isrc - 1) * *n + jr]), f2c_abs( r__2)); // , expr subst
                      xmax = max(r__3,r__4);
                      /* L220: */
                  }
                  if (xmax > safmin)
                  {
                      temp = 1.f / xmax;
                      i__1 = iend;
                      for (jr = 1;
                              jr <= i__1;
                              ++jr)
                      {
                          i__2 = jr + ieig * vr_dim1;
                          i__3 = (isrc - 1) * *n + jr;
                          q__1.r = temp * work[i__3].r;
                          q__1.i = temp * work[ i__3].i; // , expr subst
                          vr[i__2].r = q__1.r;
                          vr[i__2].i = q__1.i; // , expr subst
                          /* L230: */
                      }
                  }
                  else
                  {
                      iend = 0;
                  }
                  i__1 = *n;
                  for (jr = iend + 1;
                          jr <= i__1;
                          ++jr)
                  {
                      i__2 = jr + ieig * vr_dim1;
                      vr[i__2].r = 0.f;
                      vr[i__2].i = 0.f; // , expr subst
                      /* L240: */
                  }
              }
  L250:
              ;
          }
      }
      return 0;
      /* End of CTGEVC */
  }
  /* ctgevc_ */
  