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On 06/13/2013 05:00 PM, Jonathan Schwehm wrote:<br>
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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">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.
</span></p>
<p class="MsoNormal"><span lang="EN-US">Is there a common way to
further debug that problem and find a fix around that?</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;
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<p class="MsoNormal"><b><span style="font-size:10.0pt;
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Hello Jonathan,<br>
<br>
have you double-checked your equations ? Or are you certain that
there exists a unique solution to your problem ?<br>
<br>
Error = -8, The matrix of partial derivatives is singular.<br>
Some of your equations may be redundant.<br>
DDASSL cannot solve the problem as stated.<br>
It is possible that the redundant equations<br>
could be removed, and then DDASSL could<br>
solve the problem. It is also possible<br>
that a solution to your problem either<br>
does not exist or is not unique.<br>
<br>
Hope this help,<br>
Paul.<br>
<br>
<pre class="moz-signature" cols="72">--
Paul BIGNIER
Xcos Developer
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