(It seems you didn't received my email, sorry for the noise.)
Hi. Last week I wrote to the octave-dev mailing list reporting a bug and contributing a test, as you can see at [SF mailarchive]. There has been no reply, and the svn version of the related package (control) was not modified, as you can see at [SF svn]. Can you please tell me if you received my previous email? If you didn't, can you please suggest me why my email was dropped? Thanks. Luca Favatella [SF mailarchive] http://sourceforge.net/mailarchive/forum.php?thread_name=5a6cd4690811220713q59941de8hbe41e356df07dd0d%40mail.gmail.com&forum_name=octave-dev [SF svn] http://octave.svn.sourceforge.net/viewvc/octave/trunk/octave-forge/main/control/ On 22/11/2008, Luca Favatella <[EMAIL PROTECTED]> wrote: > Hi. > > > I'm referring to the svn version (of yesterday) of the control toolbox. > > Please add this xtest to gram function in the control toolbox. > > %!xtest > %! a = [-1 0 0; 1/2 -1 0; 1/2 0 -1]; > %! b = [1 0; 0 -1; 0 1]; > %! m = gram (a, b); > %! assert (a * m + m * a' + b *b', zeros (size (a))) > > This xtest shows that gram(a,b) doesn't behave as documented in > texinfo (texinfo is correct). > > > In the short term, a fix could be to modify gram invoking lyap with > the right arguments. > In fact it seems that who wrote gram relied on lyap behaving as the > MATLAB counterpart. > > In the mid/long term, a fix could be to leave gram untouched and > instead modify lyap to behave as the MATLAB counterpart. > > > I prefer the second solution (i.e. modify lyap to behave as the MATLAB > counterpart). > Both Octave's and Scilab's lyap(a,b) behave the same (i.e. solving a' > x + x a + b = 0), and the strange approach is that of MATLAB's > lyap(a,b) (that instead solves a x + x a' + b = 0); but I think that > it is better to target MATLAB compatibility. > Do you think this could be done for Octave-Forge >= 3.1? > > > I'm not attaching a patch to solve the problem because I think that > the problem is not to write the patch but to decide one solution. > If you have not spare time to write the patch, please let me know the > decision and I'l try to post a patch by a week. > > > > Cheers, > Luca Favatella ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
