[Octave-bug-tracker] [bug #49449] odeplot is not fully Matlab compatible

[Sebastian]

Follow-up Comment #3, bug #49449 (project octave):

Sorry, my explanation was insufficient and two things got mixed up:

1. the current octave implementation of odeplot is not fully Matlab
compatible. It only plots the last entry of the vectors given and Octave cares
whether you supply row or column vectors. However, it's working in most cases
but probably not if we implement "refine" in odeXY.

I have executed the following lines with Matlab, Octave with and without patch
 (see figures attached):
odeplot([0 10],[0;0],'init');
odeplot([0:10],[(0:10);(0:10).^2],[]);
odeplot([0:10],2*[(0:10);(0:10).^2],[]);

2. I made a new version that is slower but this is no surprise: it always
plots the whole data (as Matlab does). Matlab seems to store the data
persistently in odeplot and to concatenate the vectors in each call of
odeplot. This can be seen in the attached figure "matlab.png". There is a
straight line from (10,100) to (0,0). My implementation avoids this by using
"hold on" and "hold off", so I am more memory efficient but not
Matlab-bug-compatible.

(file #38819, file #38820, file #38821)
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Additional Item Attachment:

File name: matlab.png                     Size:100 KB
File name: octave_patched.png             Size:114 KB
File name: octave_current.png             Size:76 KB


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