[Scilab-users] bvode example broken?

[Clément David]

Hello Rene, hello all,

After an investigation on the code, there is an issue storing the initial guess of the bvode() call; latter calls will get a zeros vector as guess and failed to converge. The bug 12418 [1] already report the issue, please comment here. IMHO this behavior might be handled without pushing the guessed values back to Scilab thus preserving the prototype.

 [1]: https://bugzilla.scilab.org/show_bug.cgi?id=12418

Thanks,

Clément

> -----Original Message-----
> From: users <users-bounces at lists.scilab.org> On Behalf Of Rene Djack
> Sent: Thursday, July 16, 2020 2:05 PM
> To: Users mailing list for Scilab <users at lists.scilab.org>
> Subject: Re: [Scilab-users] bvode example broken?
> 
> Also tested on linux/scilab 5.5.2 --> no error I will post in scilab bugzilla.
> Thanks for your answers
> Rgds
> René
> 
> 
> 
> 
> 
> Le mer. 15 juil. 2020 à 21:20, Stéphane Mottelet <stephane.mottelet at utc.fr
> <mailto:stephane.mottelet at utc.fr> > a écrit :
> 
> 
> 	Hi,
> 
> 	Same error on OSX since 6.0.2 version. I cannot test for 5.5.2 version
> because bvode was broken (it was fixed by desactivating  optimization
> compilation  flags).
> 
> 
> 	S.
> 
> 
> 	Le 15/07/2020 à 20:24, Rafael Guerra a écrit :
> 
> 
> 		Hi,
> 
> 		Face same error in Win10 Scilab 6.1.0.
> 
> 		But no such error in Win10 Scilab 5.5.2.
> 
> 		Rgds,
> 
> 		Rafael
> 
> 
> 
> 		From: users <users-bounces at lists.scilab.org> <mailto:users-
> bounces at lists.scilab.org>  On Behalf Of Rene Djack
> 		Sent: Wednesday, July 15, 2020 8:39 PM
> 		To: users at lists.scilab.org <mailto:users at lists.scilab.org>
> 		Subject: [Scilab-users] bvode example broken?
> 
> 
> 
> 		Hello,
> 
> 		I' m new to this list and to scilab too!
> 
> 		Working on bvode, I try the example "Quantum Neumann
> equation" found in the scilab help and i get the error message
> 
> 		"Collocation matrix is singular"
> 
> 		Is this example broken?
> 
> 		Somebody have the same message?
> 
> 
> 
> 		I'm using scilab 6.10 from scilab-6.10.bin.linux-x86-64.tar.gz on
> Ubuntu 20.4
> 
> 
> 
> 		Tanks for reading
> 
> 		Regards
> 
> 
> 
> 
> 
> 
> 
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> 	--
> 	Stéphane Mottelet
> 	Ingénieur de recherche
> 	EA 4297 Transformations Intégrées de la Matière Renouvelable
> 	Département Génie des Procédés Industriels
> 	Sorbonne Universités - Université de Technologie de Compiègne
> 	CS 60319, 60203 Compiègne cedex
> 	Tel : +33(0)344234688
> 	http://www.utc.fr/~mottelet
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