Re: matlab and octave

[Laurent Jacques]

Try something with the help of the following function which works under octave 
and matlab.

Laurent.

---- ismatlab.m
function out = ismatlab()
%% Return 1 if you are in matlab and 0 if you are in octave
%% This uses the very long output of command version under matlab
%% This is not very clean but it is quickly checked
info=version;
if (length(version) > 10)
  out = 1;
else
  out = 0;
end
----

And a simple test which works too under matlab and octave:

---- test.m
function test()

if (ismatlab)
 plot(1:5);
else
 plot(1:5);
 replot;
end
----


On Tuesday 18 November 2003 13:17, A. S. Budden wrote:
| Hi there,
|
| I use both octave and matlab a lot -- octave on my laptop and matlab on
| the university machines.  Is there any way of adding lines into a .m
| file such that either matlab or octave (mainly the former) will ignore
| the command.  For example, I have a file with the line replot --
| this seems to be required in octave to update the gnuplot window.
| However, matlab generates an error message if I run it there.  I realise
| I could make a function called replot that does nothing in matlab and
| put it in a central store, but this could get messy if there are a lot
| of functions that are required.
|
| Also, I've found that the axis command doesn't seem to work very well in
| octave.  In my .m file I have a function plot_ab (at the end of this
| email).  The line ax=axis returns [-1.8131 1.3346 -0.9580 1.5246] in
| matlab and the plot virtually fills the window.  In octave, ax=axis
| returns [-10 10 -10 10] and the plot is only about 1/10 the size of the
| window.
|
| Can anyone offer any suggestions with either of these problems?
|
| Many thanks in advance,
|
| Al
|
|
| function plot_ab(parametera, parameterb);
| % Plot first parameter against second parameter with fixed axis
| % for i=1:size(parametera,1)
|
| for i=1:size(parametera,1),
|       plot(parametera(i,:), parameterb(i,:), 'b-', 0,0,'bx');
|       if ( i==1 )
|               axis('equal');
|               replot;
|               % Add 50% on to each axis and remember
|               ax = axis;
|               if (abs(ax(1)) > abs(ax(2)))
|                       ax(2) = -ax(1);
|               else
|                       ax(1) = -ax(2);
|               end;
|               if (abs(ax(3)) > abs(ax(4)))
|                       ax(4) = -ax(3);
|               else
|                       ax(3) = -ax(4);
|               end;
|               ax = ax*1.2;
|               axis(ax)
|               axis('equal');
|               replot;
|               ax = axis;
|       end;
|       axis(ax);
|       xlabel('\alpha Axis Current');
|       ylabel('\beta Axis Current');
|       pause(0.1);
| end;
|
|
|
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| Octave is freely available under the terms of the GNU GPL.
|
| Octave's home on the web:  http://www.octave.org
| How to fund new projects:  http://www.octave.org/funding.html
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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