[Scilab-users] dassl Errors

[Paul BIGNIER]

On 06/13/2013 05:00 PM, Jonathan Schwehm wrote:
>
> Hello,
>
> I am currently  trying to program a dynamic model of an electrolyzer ( 
> lots of physical equations), by using the dassl solver. I implemented 
> a lot of euqations in my res function and now I am stuck on the Error 
> -8 -->Singularity.
>
> Is there a common way to further debug that problem and find a fix 
> around that?
>
> Mit freundlichen Grüßen / Kind regards,
>
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Hello Jonathan,

have you double-checked your equations ? Or are you certain that there 
exists a unique solution to your problem ?

Error = -8, The matrix of partial derivatives is singular.
                   Some of your equations may be redundant.
                   DDASSL cannot solve the problem as stated.
                   It is possible that the redundant equations
                   could be removed, and then DDASSL could
                   solve the problem. It is also possible
                   that a solution to your problem either
                   does not exist or is not unique.

Hope this help,
Paul.

-- 
Paul BIGNIER
Xcos Developer
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Scilab Enterprises
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