HDTenEightyP/NetNews huggingface dataset:
From: sumargoh@widget.fiu.edu
Subject: Some Questions on Matlab
Reply-To: sumargoh@fiu.edu
Organization: FIU, Electrical & Computer Engineering Dept.
Date: Tue, 26 Jan 1993 16:25:01 GMT

Hi, I am currently using Matlab 3.5g on a VAX.  I have some questions to ask:

1.  If I use EIGS() MatLab built in function to find the eigensystem of a given matrix,
    I noticed that the results obtained show that the eigenvalues are arranged in
    ascending order.  Is there any switch that I can use to tell the EIGS() funtion
    to put out the eigenvalues in a descending order?

2.  The MatLab package comes with some C source codes to read binary files and convert
    them to numbers.  I tried to implement a binary to number conversion using the
    above mentioned C source codes with no avail.  Has anyone out there ever written
    such routine in C and would like to share?

Please kindly send your response to sumargoh@fiu.edu.  Thank you very much.
From: ellert@v32.uh.cwru.edu
Newsgroups: comp.soft-sys.matlab
Subject: Re: DISP1:  disp1.m - display text and numbers
Date: 25 Jan 93 14:39:53 GMT
Article-I.D.: usenet.1k0u3pINN1bm
Reply-To: ellert@nu1.uh.cwru.edu
Distribution: world
Organization: Image Analysis Center, Univ. Hospitals of Cleveland
NNTP-Posting-Host: max.uh.cwru.edu


In article <GRAY.93Jan25093751@snow.scr.slb.com>, gray@snow.scr.slb.com (Douglas Gray Stephens) writes:
>If you want more control over the format of the numbers, you should
>use the fprintf command, e.g.
>
>  fprintf('x measures blah blah, its value is %.4g\n',x)
>
>(you also have more explicit control over the line breaks).
>

A word of warning on the fprintf function -- under VMS 5.5-2, matlab versions
3.5f and 3.5g, I have had the ever so thrilling symbolic stack dump as a
result of placing fprintf calls inside loops.  These calls have been to
to the display, rather than to files, and have had the legal number of
arguments.

Ed
ellert@nu1.uh.cwru.edu
Newsgroups: comp.soft-sys.matlab
From: gray@snow.scr.slb.com (Douglas Gray Stephens)
Newsgroups: comp.soft-sys.matlab
Subject: Re: Figure Caption
Date: 22 Jan 93 09:17:32
Organization: Schlumberger Cambridge Research
NNTP-Posting-Host: snow.scr.slb.com
In-reply-to: ysun@phys2adm.usc.edu's message of 21 Jan 1993 11:50:44 -0800

In article <1jmuqlINNfal@phys2adm.usc.edu> ysun@phys2adm.usc.edu (Ye Sun) writes:
   I am currently using MATLAB-4.0 on SPARC station. I mainly use it
   for scientific plotting. But I have some problem in writing Greek
   letters in the figure.    Does anybody know how to do it in MATLAB?
   Maybe at least using Latex. 

   Along with this, how to change the default 'font' and 'linewidth' etc?

The font issue has been addressed in Matlab version 4.0a (released
11-Dec-92).  Matlab now has extra graphic handles, including FontName,
FontBold, FontSpacing,FontSize, FontItalic, FontUnderline,
FontStrikeThrough, FontShadow, and FontOutline.  This does not help
with the mixing roman and greek characters in the same string.  

I insert greek characters into LaTeX, by saving the matlab file as
Encapuslated PostScript, then reading the file into IslandDraw, which
can read and graphically edit PostScript files.  I then save the file
as EPS from IslandDraw, and insert that file into LaTeX.  (This has
the additional advantage that you get the correct BoundingBox.)

It would be nice when matlab finally manages to generate a legal
Encapsulated PostScript file.

Currently it is not possible to set the linewidth in matlab
(MarkerSize yes).  I've grumbled at MathWorks about this limitation.

--
----------------------------------------------------------------------------
Dr. Douglas GRAY STEPHENS                e-mail : gray@scr.slb.com   
Schlumberger Cambridge Research          Tel/fax: 0223-325303 / 0223-311830
P.O.Box 153, Cambridge CB3 0HG, England  (International prefix for UK: 44)
============================================================================
From: np4@prism.gatech.EDU (Nick Pomponio)
Newsgroups: comp.soft-sys.matlab
Subject: Simulink under OS/2 2.1
Date: 25 Jan 93 03:46:38 GMT
Organization: Georgia Institute of Technology

Has anyone tried to run the Windows version of Simulink under the OS/2 2.1
beta?  OS/2 2.1 supposedly runs enhanced-mode Windows applications (i.e.
Simulink).

While I'm at it, has anyone tried to run Matlab 4.0 under OS/2 2.0 or 2.1?
Version 3.5k would run under OS/2 2.0, and I'd like to know about 4.0 in
order to decide whether to upgrade.  The last time I contacted Mathworks
about OS/2, they didn't seem interested at all and indicated that I'd be
on my own.

-- 
POMPONIO,NICHOLAS A
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!np4
Internet: np4@prism.gatech.edu
Newsgroups: comp.soft-sys.matlab
From: moler@sccm.Stanford.EDU (Cleve Moler)
Subject: Hello from MathWorks
Summary: Hi
Organization: Scientific Computing/Computational Mathematics (SCCM), Stanford U.
Date: Sun, 24 Jan 1993 21:40:09 GMT


Hi.  This is the first posting from The MathWorks to comp.soft-sys.matlab.
I'm posting it from Stanford because we're having trouble posting to
newly establish groups, including comp.soft-sys.matlab, from the MathWorks
machines in Massachusetts.  We can post to old, established groups, but
not to some new ones, including what is now the most important group for
us.  If anybody else is having similar difficulties, please let us know.

Thanks to Michael Maurer at Stanford for initiating the group.  The size
of the vote in favor, and the level of participation this first week, are
certainly good signs for an active, useful group.

At the MathWorks, we intend to follow the group's activities, to respond
individually to technical and informational queries, and to post general
responses and announcements when we believe they are of broad interest.
We certainly intend to respect the Net's noncommercial culture.

We hope that many of the queries will be answered by other group
participants.  The discussion we've seen so far of MATLAB/Unix memory
management is a good example of how this ought to work.

Thanks to all of you for your support of MATLAB.  With your help,
comp.soft-sys.matlab can be a valuable, and enjoyable, activity for
all of us.

    -- Cleve Moler
    Chairman and Chief Scientist
    The MathWorks
    moler@mathworks.com
Newsgroups: comp.soft-sys.matlab
From: mnb2@cunixf.cc.columbia.edu (Mark Nathan Broadie)
Subject: DISP1:  disp1.m - display text and numbers 
Reply-To: mnb2@cunixf.cc.columbia.edu (Mark Broadie)
Organization: Columbia University
Date: Sat, 23 Jan 1993 15:27:29 GMT

Trying to continue the trend, here is an m-file for display
text and numbers to the screen on a single line.  I had m-files
filled with statements like
   disp('x measures blah blah, its value is');  disp(x);
which (a) uses 2 display statements and (b) does not appear
on a single line on the screen.  The m-file disp1.m allows the
statement
   disp1('x measures blah blah, its value is ', x);

Keep these submissions coming!

-mark broadie


------ cut here -------

function disp1(s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);
% DISP1
% displays up to ten arguments on the screen
% e.g., x = 2.3;
%       disp1('x = ', x, ', 2*x = ', 2*x);
% will print 'x = 2.3, 2*x = 4.6' on the screen

% Mark Broadie  1-20-93
% Copyright (c) 1993.

s = [];
for i = 1 : nargin;
    x = eval(['s',int2str(i)]);

    % num2str.m code follows with '%.6g' replacing '%.4g'
    if isstr(x)
            t = x;
    else
            t = sprintf('%.6g',x);
    end

    s = [s t];
    end;

disp(s);

% end of disp1.m
Newsgroups: comp.soft-sys.matlab
From: wayne@netcom.com (wayne t. watson)
Subject: EOF on .MAT file
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: usa
Date: Wed, 27 Jan 1993 20:36:25 GMT

Is the last record (matrix variable record data) written by Save a header
(20 bytes) with a name length of 0 (PC version)?  Is this the way the
PC version determines the EOF or is there supposed to be some other
indicator at the end of the file (.MAT files)?
-- 
Wayne T. Watson   wayne@netcom.com (415) 969-4233
Mountain View, CA
Newsgroups: comp.soft-sys.matlab
From: mnb2@cunixf.cc.columbia.edu (Mark Nathan Broadie)
Subject: Re: DISP1:  disp1.m - display text and numbers 
Reply-To: mnb2@cunixf.cc.columbia.edu (Mark Broadie)
Organization: Columbia University
Date: Mon, 25 Jan 1993 14:28:24 GMT

Thanks for the comments about disp1.m.  I realize you don't need
an m-file for this, but it's easier.  disp1.m takes up to 10 
arguments, with strings or numbers in any order.  fprintf and
sprintf are limited to 3 arguments.  disp1 is slightly simpler
and shorter than using num2str directly:
    disp1('x = ', x, ' y = ', y)
vs.
    disp(['x = ' num2str(x) ' y = ' num2str(y)])

In general, I find that display information 'nicely' is not easy
with MATLAB.  For example, does anyone have a *simple* way to
display a small table with row and column headings.  By simple,
I mean not having to count spaces.  For example, an m-file
to display

                 Col1 head     Col2 heading      Col3 head
Row1 label           0.0            1.0             -3.4
Row2 label here      0.0            1.0             -3.4
Row3 label           0.0            1.0             -3.4

 
-mark broadie
From: Ray Zimmerman <rz10@cornell.edu>
Newsgroups: comp.soft-sys.matlab
Subject: Re: fscanf in v4.0
Date: 26 Jan 1993 14:44:59 GMT
Organization: Electrical Engineering, Cornell University
Distribution: world
NNTP-Posting-Host: ziklag.ee.cornell.edu
X-UserAgent: Nuntius v1.1.1d17
X-XXMessage-ID: <A78AB9CE7501E0B5@ziklag.ee.cornell.edu>
X-XXDate: Tue, 26 Jan 93 14:50:06 GMT

In article <C1Fqxv.HKo@taurus.cs.nps.navy.mil> Jim Stockel,
stockel@taupo.oc.nps.navy.mil writes:
>I'm fairly new to Matlab and have v4.0.  A typical data file for me
contains
>some strings for documentation/plot labeling, and some data.  I've tried
>the [A,count] = fscanf(fid,'format',size)  routine for reading strings, 
>but it leaves something to be desired.  With no size argument, 
>it tries to read to the end of file.  If a size argument is used
>then that is the number of whitespace seperated groups of characters are 
>read (ie. words).  Isn't there a way to read a newline terminated string?
>Am I missing something?  Is there a better way to read strings?

Try "fgets" or "fgetl".  If you need to extract pieces from the line
you can do that with "sscanf".  This is what I've been doing and it
works ... but, as always, there may be a better way.

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
 Ray Zimmerman           \ 397 Theory Center, Electrical Engineering
                          \ Cornell University, Ithaca NY  14853
 Ray-Zimmerman@cornell.edu \ Phone: 607-254-8819  Fax: 607-255-9072
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
        "The number you have dialed is imaginary.
                    Rotate phone 90 degrees and try again."
From: c23dca@kocrsv01.delcoelect.com (David C. Anthony)
Newsgroups: comp.soft-sys.matlab
Subject: 3rd party matlab manuals
Date: 25 Jan 93 17:55:32 GMT
Organization: Delco Electronics Corp.
Originator: c23dca@koptsy10


Does anyone have suggestions for a good third party book on matlab? 
Do they even exist?  Ideally I'd like to find one with examples.

Thanks in advance,

David Anthony                    c23dca@kocrvs01.delcoelect.com
Powertrain Electronics           (317) 451-0835
Delco Electronics
Newsgroups: comp.soft-sys.matlab
From: gsrao@eos.ncsu.edu (GANESH SUBBA RAO)
Subject: MATLAB vs. ACSL
Organization: North Carolina State University, Project Eos
Date: Thu, 28 Jan 1993 20:30:13 GMT

Hi,
I was just curious about the differences between matlab/simulab and acsl
as far as simulation of dynamical systems is concerned. I use matlab
but many here at the office use acsl code. I also know that acsl can use
matlab as a computational engine. So what's the difference? Has anyone who
has used both please tell me? Is one more efficient than the other?

While I'm here, I'd like to know if the Mathworks has student or discount
pricing on PC matlab. I got a price list in the mail recently and $1600 is
more than I have lying around.

Thanks in advance.

-Ganesh


    +-----------------------------------------------------------+
    | Ganesh Rao              NCSU Precision Engineering Center |
    | gsrao@eos.ncsu.edu      122 Research Bldg. 1              |
    | phone:(919) 515-3141    Centennial Campus                 |
    +-----------------------------------------------------------+

Newsgroups: comp.soft-sys.matlab
From: Michael Maurer <maurer@nova.stanford.edu>
Subject: SOURCE: mat2str.m - convert matrix to string format
Organization: STAR Lab, Stanford University, California USA
Date: 23 Jan 93 01:04:07 GMT

Hoping to start a trend, here is an unsolicited matlab m-file.
MAT2STR is like NUM2STR, but operates on matrix input.
Suggested improvements are welcome.

#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
#	mat2str.m
# This archive created: Fri Jan 22 16:55:43 1993
export PATH; PATH=/bin:$PATH
echo shar: extracting "'mat2str.m'" '(468 characters)'
if test -f 'mat2str.m'
then
	echo shar: will not over-write existing file "'mat2str.m'"
else
sed 's/^XX//' << \SHAR_EOF > 'mat2str.m'
XXfunction T=mat2str(X,nc,nd)
XX
XX%MAT2STR
XX%	T=mat2str(X) converts matrix X into string format T, using sprintf
XX%	to convert each element of X.
XX%	T=mat2str(X,nc) uses nc characters for each column, instead of
XX%	default 12.
XX
XX%	Michael Maurer, 10 Jan 1992
XX%	Copyright (c) 1993 by Michael Maurer
XX
XXif nargin<2,
XX   nc=12;
XXend
XX
XX[mx,nx]=size(X);
XXT=ones(mx,nc*nx)*abs(' ');
XXfor i=1:mx,
XX   for j=1:nx,
XX      t=sprintf('%.4g',X(i,j));
XX      T(i,nc*(j-1)+(1:length(t)))=t;
XX   end
XXend
SHAR_EOF
if test 468 -ne "`wc -c < 'mat2str.m'`"
then
	echo shar: error transmitting "'mat2str.m'" '(should have been 468 characters)'
fi
fi # end of overwriting check
#	End of shell archive
exit 0
--
______________________________________________________________________
Michael Maurer          maurer@nova.stanford.edu        (415) 723-1024
Newsgroups: comp.soft-sys.matlab
From: sgsying@en.ecn.purdue.edu (Goangshiuan Ying)
Subject: Data conversion program for converting AT-CODAS to MATLAB
Organization: Purdue University Engineering Computer Network
Date: Mon, 25 Jan 93 16:42:40 GMT

I have written a data conversion program for converting the data file
with AT-CODAS format into MATLAB format.  If any one is interested
getting the executible file, let me know....


Shawn Ying
sgsying@ecn.purdue.edu
From: cnar08@ccsun.strath.ac.uk ("M.Akbar", Electrical Engineering)
Newsgroups: comp.soft-sys.matlab
Subject: Scale problems with multiple plots
Date: 27 Jan 93 17:30:17 GMT
Reply-To: cnar08@ccsun.strath.ac.uk
Organization: Strathclyde University Computer Centre.


I need to get multiple plots on one page but am having
problems setting the scale.

I use matlab on a Sun and in the graphic window the 
plot looks okay.But while using gpp the axis are rescaled.

For example on a single plot I would get the
x-axis from 10^-3 to 10^3 and y-axis -120dB to 20dB
which prints out okay. But if I use subplot(211) ..(222)  etc
the axis are divided in a different way.

The problem seems to be that Matlab cannot reduce the character size
and even for multiple plots the numbering can be huge.

Has anyone been able to get around this problem.

Any help will be much appreciate.

---------------------------------------------------------------------
Mahmood Akbar
Industrial Control Centre
University of Strathclyde
Glasgow G1 1 QE

cnar08@uk.ac.strath.vaxb
---------------------------------------------------------------------
From: little@mathworks.com (John Little)
Newsgroups: comp.soft-sys.matlab
Subject: Re: Matlab User Group?????
Date: 26 Jan 93 23:25:01 GMT
Organization: The MathWorks, Inc.
X-Useragent: Nuntius v1.1

In article <1993Jan18.234210.11380@vax.oxford.ac.uk> ,
reese@vax.oxford.ac.uk writes:

>
>Could someone please tell me how I can access the Matlab User Group?
>
>Thanks very much.
>
>Jason

To join the MATLAB Users Group and receive the email MATLAB News digest,
send your email address to matlab-users-request@mcs.anl.gov.  The digest
is not as regular as it might be.....

They also run a netlib that contains user-contributed M-files.  You should
get a reply with information on how to use it if you send email to the
above address.


John Little
Newsgroups: comp.soft-sys.matlab
From: John Little <little@mathworks.com>
Subject: Re: Getting rid of pesky startup window
Organization: The MathWorks, Inc.
X-Useragent: Nuntius v1.1
Date: Thu, 28 Jan 1993 00:29:18 GMT

In article <1993Jan27.190653.27282@informatik.uni-bremen.de> Bengt
Martensson, 
bengt@mathematik.uni-Bremen.de writes:

>How can I get rid of that pesky window Matlab opens for a few seconds
>during startup? It drives me nuts! There doesn't seem to be a
>documented way. (Mathworks, why oh why...)
>
>I am using Matlab 4.0 (Aug 28 1992) with X on the Sparc.
>

The "spash screen" does NOT add to the startup time. It is put up
at the beginning of MATLAB's initialization and taken down
at the end.

It's actually used by the GUI widget set to figure out the size
of the borders on the window manager that you are using so that
the window can be positioned accurately.  X allows you to use 
a window manager of your choice and we do not know this ahead
of time.
Newsgroups: comp.soft-sys.matlab
From: Michael Maurer <maurer@nova.stanford.edu>
Subject: SOURCE: vfeval.m - feval with extra arguments
Organization: STAR Lab, Stanford University, California USA
Date: 23 Jan 93 01:00:30 GMT

Hoping to start a trend, here is an unsolicited matlab m-file.
VFEVAL is like FEVAL but allows extra arguments.

#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
#	vfeval.m
# This archive created: Fri Jan 22 16:56:12 1993
export PATH; PATH=/bin:$PATH
echo shar: extracting "'vfeval.m'" '(547 characters)'
if test -f 'vfeval.m'
then
	echo shar: will not over-write existing file "'vfeval.m'"
else
sed 's/^XX//' << \SHAR_EOF > 'vfeval.m'
XXfunction y=vfeval(fun,P1,P2,P3,P4,P5,P6,P7,P8,P9,P10)
XX
XX%VFEVAL
XX%	y=vfeval(fun,P1,...).  Like FEVAL, but allows up to 10 extra
XX%	arguments named P1,P2,...,P10. 
XX%	Example:
XX%		y = vfeval('2*sin(P1+P2)',a,b)
XX
XX%	See FMIN.M for inspiration.
XX%	Michael Maurer, 10 Feb 1992.
XX%	Copyright (c) 1993 by Michael Maurer
XX
XXif any(fun<48),
XX   evalstr=fun;
XXelse
XX   evalstr=[fun, '('];
XX   for argc=1:nargin - 1
XX      if argc>1, 
XX	 evalstr=[evalstr ','];
XX      end
XX      evalstr = [evalstr,'P',num2str(argc)];
XX   end
XX   evalstr = [evalstr, ')'];
XXend
XXy=eval(evalstr);
SHAR_EOF
if test 547 -ne "`wc -c < 'vfeval.m'`"
then
	echo shar: error transmitting "'vfeval.m'" '(should have been 547 characters)'
fi
fi # end of overwriting check
#	End of shell archive
exit 0
--
______________________________________________________________________
Michael Maurer          maurer@nova.stanford.edu        (415) 723-1024
From: rickb@ballantyne.Corp.Sun.COM (Rick Ballantyne)
Newsgroups: comp.soft-sys.matlab
Subject: Donate
Date: 23 Jan 1993 01:37:56 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: rickb@ballantyne.Corp.Sun.COM
NNTP-Posting-Host: ballantyne.corp.sun.com


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Donate!  Donate!  Donate!  Donate!   Donate!    Donate!    Donate!
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  closet or garage that isn't being used?

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Thank you in advance for your help!

Newsgroups: comp.soft-sys.matlab
From: gray@snow.scr.slb.com (Douglas Gray Stephens)
Newsgroups: comp.soft-sys.matlab
Subject: Re: Purpose of %%BeginPreview ... %%EndPreview in eps files
Date: 25 Jan 93 09:45:38
Organization: Schlumberger Cambridge Research
NNTP-Posting-Host: snow.scr.slb.com
In-reply-to: jnicolas@image.mit.edu's message of Sat, 23 Jan 1993 05:16:08 GMT

In article <JNICOLAS.93Jan23001608@image.mit.edu> jnicolas@image.mit.edu (Julien Nicolas) writes:

   Eps files generated with 'print -deps' are huge. Unecessarily so it
   seems. They contain, at least under 4.0, a section with no information:

   %%BeginPreview: 560 420 1 420
   %ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
   ...
   %%EndPreview


MathWorks has always failed to generate good Encapsulated PostScript.
The PostScript Language Reference manual states that only required header
comments are:-

       %!PS-Adobe-3.0 EPSF-3.0
       %%BoundingBox llx lly urx ury

The preview image is required for Encapsulated PostScript interchange
format (EPSI) files, but matlab's print refers to EPSF files, which do
not require the image.

I believe that MathWorks had several discussions about this, and I'm
glad to say that version 4.0a corrects this feature, so the print
command now has an optional "-preview" argument.

I wish that MathWorks get its house in order and generate the correct
BoundingBox for its EPS files.

--
----------------------------------------------------------------------------
Dr. Douglas GRAY STEPHENS                e-mail : gray@scr.slb.com   
Schlumberger Cambridge Research          Tel/fax: 0223-325303 / 0223-311830
P.O.Box 153, Cambridge CB3 0HG, England  (International prefix for UK: 44)
============================================================================
From: ysun@phys2adm.usc.edu (Ye Sun)
Newsgroups: comp.soft-sys.matlab
Subject: Figure Caption
Date: 21 Jan 1993 11:50:44 -0800
Organization: University of Southern California, Los Angeles, CA
NNTP-Posting-Host: phys2adm.usc.edu
Keywords: figure caption

Hi,

I am currently using MATLAB-4.0 on SPARC station. I mainly use it for scienti-
fic plotting. But I have some problem in writing Greek letters in the figure.
Does anybody know how to do it in MATLAB?  Maybe at least using Latex.

Along with this, how to change the default 'font' and 'linewidth' etc?


Thanks in advance.

Ye Sun
Dept. of Physics
Univ. of So. Cal.

email: ysun@physics.usc.edu
From: damour@hobbes.sanders.lockheed.com (Kevin Damour)
Newsgroups: comp.soft-sys.matlab
Subject: Re: Matlab4.0 versus Framemaker3.1.1
Date: 25 Jan 93 19:21:22 GMT
Organization: Lockheed Sanders, Inc.
In-reply-to: jeff@control.nd.edu's message of 22 Jan 93 20:24:55 GMT

In article <1993Jan22.202455.18778@news.nd.edu> jeff@control.nd.edu (Jeffrey C. Kantor) writes: