text: /*
   * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
   * Copyright (C) 1998-2003 Kenneth B. Russell (kbrussel@alum.mit.edu)
   *
   * Copying, distribution and use of this software in source and binary
   * forms, with or without modification, is permitted provided that the
   * following conditions are met:
   *
   * Distributions of source code must reproduce the copyright notice,
   * this list of conditions and the following disclaimer in the source
   * code header files; and Distributions of binary code must reproduce
   * the copyright notice, this list of conditions and the following
   * disclaimer in the documentation, Read me file, license file and/or
   * other materials provided with the software distribution.
   *
   * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
   * holder may not be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
   * KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
   * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
   * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
   * COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
   * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
   * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
   * COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
   * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
   * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
   * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
   * INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
   * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
   * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
   * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
   * WARRANTY OF FITNESS FOR SUCH USES.
   */
  
  package org.gephi.lib.gleem.linalg;
  
  /** Arbitrary-size single-precision matrix class. Currently very
      simple and only supports a few needed operations. */
  
  public class Matf {
    private float[] data;
    private int nCol; // number of columns
    private int nRow; // number of columns
  
    public Matf(int nRow, int nCol) {
      data = new float[nRow * nCol];
      this.nCol = nCol;
      this.nRow = nRow;
    }
  
    public Matf(Matf arg) {
      nRow = arg.nRow;
      nCol = arg.nCol;
      data = new float[nRow * nCol];
      System.arraycopy(arg.data, 0, data, 0, data.length);
    }
  
    public int nRow() {
      return nRow;
    }
  
    public int nCol() {
      return nCol;
    }
  
    /** Gets the (i,j)th element of this matrix, where i is the row
        index and j is the column index */
    public float get(int i, int j) {
      return data[nCol * i + j];
    }
    
    /** Sets the (i,j)th element of this matrix, where i is the row
        index and j is the column index */
    public void set(int i, int j, float val) {
      data[nCol * i + j] = val;
    }
  
    /** Returns transpose of this matrix; creates new matrix */
    public Matf transpose() {
      Matf tmp = new Matf(nCol, nRow);
      for (int i = 0; i < nRow; i++) {
        for (int j = 0; j < nCol; j++) {
          tmp.set(j, i, get(i, j));
        }
      }
      return tmp;
    }
    
    /** Returns this * b; creates new matrix */
    public Matf mul(Matf b) throws DimensionMismatchException {
      if (nCol() != b.nRow())
        throw new DimensionMismatchException();
      Matf tmp = new Matf(nRow(), b.nCol());
      for (int i = 0; i < nRow(); i++) {
        for (int j = 0; j < b.nCol(); j++) {
          float val = 0;
          for (int t = 0; t < nCol(); t++) {
            val += get(i, t) * b.get(t, j);
          }
          tmp.set(i, j, val);
        }
      }
      return tmp;
    }
  
    /** Returns this * v, assuming v is a column vector. */
    public Vecf mul(Vecf v) throws DimensionMismatchException {
      if (nCol() != v.length()) {
        throw new DimensionMismatchException();
      }
      Vecf out = new Vecf(nRow());
      for (int i = 0; i < nRow(); i++) {
        float tmp = 0;
        for (int j = 0; j < nCol(); j++) {
          tmp += get(i, j) * v.get(j);
        }
        out.set(i, tmp);
      }
      return out;
    }
  
    /** If this is a 2x2 matrix, returns it as a Mat2f. */
    public Mat2f toMat2f() throws DimensionMismatchException {
      if (nRow() != 2 || nCol() != 2) {
        throw new DimensionMismatchException();
      }
      Mat2f tmp = new Mat2f();
      for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
          tmp.set(i, j, get(i, j));
        }
      }
      return tmp;
    }
  
    /** If this is a 3x3 matrix, returns it as a Mat3f. */
    public Mat3f toMat3f() throws DimensionMismatchException {
      if (nRow() != 3 || nCol() != 3) {
        throw new DimensionMismatchException();
      }
      Mat3f tmp = new Mat3f();
      for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
          tmp.set(i, j, get(i, j));
        }
      }
      return tmp;
    }
  
    /** If this is a 4x4 matrix, returns it as a Mat4f. */
    public Mat4f toMat4f() throws DimensionMismatchException {
      if (nRow() != 4 || nCol() != 4) {
        throw new DimensionMismatchException();
      }
      Mat4f tmp = new Mat4f();
      for (int i = 0; i < 4; i++) {
        for (int j = 0; j < 4; j++) {
          tmp.set(i, j, get(i, j));
        }
      }
      return tmp;
    }
  }
  