From help-octave-request at octave dot org Sun Apr 25 22:58:36 2004
Subject: Re: How to keep print compatiable with MATLAB
From: Joe Koski <jkoski11 at comcast dot net>
To: Octave Help <help at octave dot org>
Date: Sun, 25 Apr 2004 21:57:45 -0600

on 4/25/04 9:02 PM, David Bateman at David dot Bateman at motorola dot com wrote:

> According to Etienne Grossmann <etienne at cs dot uky dot edu> (on 04/25/04):
>> 
>>   Hello,
>> 
>> what about sthing like:
>> 
>>   if exist ("octave_config_info")
>>     ## Octave code
>>   else
>>     ## Matlab code
>>   end
> 
> I prefer to test for OCTAVE_VERSION, but hey. You might need to also
> use "eval" of functions that exist in Octave and not matlab and
> vis-a-versa to avoid parse errors. For instance your example would
> become
> 
> if exist ("octave_config_info")
> %plot frequency response
> N = 16634;
> [h, f] = freqz(B, A, N, fs);
> eval('gset terminal windows');
> eval('gset title "A-weighting Cureve Frequecny Response"');
> eval('gset grid');
> eval('gset nokey');
> semilogx(f, 20*log10(abs(h)));
> 
> %print plot to PNG pic file
> eval('gset terminal png');
> eval('gset output "myplot.png"')
> replot
> else
> % Matlab code
> end
> 
Just a quick observation. If Octave and Matlab were compiled instead of
interpreted, this approach wouldn't be possible at all. A compiler would
choke when it saw the other language's instruction set in the if statement.
Are there potential syntax checking problems that could derail this
approach?

Joe Koski



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