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List: scilab-users
Subject: Re: [Scilab-users] dassl Errors
From: Paul BIGNIER <paul.bignier () scilab-enterprises ! com>
Date: 2013-06-14 8:56:27
Message-ID: 51BADABB.5010209 () scilab-enterprises ! com
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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,
>
> ------------------------------------------------------------------------
>
> *Jonathan Schwehm*
>
> B.Eng
>
> Fon: +49 711 229645 51
>
> Fax: +49 711 229645 99
>
> Email: jonathan.schwehm@etogas.com <mailto:jonathan.schwehm@etogas.com>
>
> ETOGAS Image
>
> http://www.etogas.com <http://www.etogas.com/>
>
> *ETOGAS GmbH*
>
> Achtung: SolarFuel GmbH heißt jetzt ETOGAS GmbH. Bitte beachten Sie
> unsere neuen e-mail-Adressen und unsere neue Internetadresse. Darüber
> hinaus ändern sich keine Kontaktdaten.
>
> Industriestraße 6, D-70565 Stuttgart
> Geschäftsführung: Dipl.-Ing. Gregor Waldstein, MBA | Dipl.-Ing. Dr.
> oec. HSG Karl Maria Grünauer
> Registergericht: Amtsgericht Stuttgart
> Handelsregister Nr.: HRB 733792
> Steuernummer: 99065/08453
> ------------------------------------------------------------------------
> USt-IdNr.: DE 27 216 66 37 Commerzbank AG, BLZ 600 800 00, KontoNr.
> 0902 1048 00
> BIC: DRES DE FF 600, IBAN: DE78 6008 0000 0902 1048 00
> ------------------------------------------------------------------------
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>
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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
-----------------------------------------------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles, France
Phone: +33.1.80.77.04.68
http://www.scilab-enterprises.com
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On 06/13/2013 05:00 PM, Jonathan Schwehm wrote:<br>
</div>
<blockquote
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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;
font-family:"Arial","sans-serif";
color:#1F497D" lang="DE-AT">Mit freundlichen Grüßen / Kind
regards,</span><span style="font-size:10.0pt; color:#1F497D"></span></p>
<div class="MsoNormal" style="text-align:center" align="center"><span
style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D" lang="EN-GB">
<hr align="center" size="2" width="100%">
</span></div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;
font-family:"Arial","sans-serif";
color:#1F497D">Jonathan Schwehm</span></b><span
style="font-size:10.0pt; color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D">B.Eng</span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D"> </span><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D">Fon: \
+49 711 229645 51</span><span style="color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D" \
lang="EN-US">Fax: \
+49 711 229645 99</span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;
font-family:"Arial","sans-serif";
color:#1F497D" \
lang="EN-US">Email: \
<a moz-do-not-send="true"
href="mailto:jonathan.schwehm@etogas.com"><span
style="color:blue">jonathan.schwehm@etogas.com</span></a></span><span
style="color:#1F497D" lang="EN-US"></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
</div>
<span style="font-family:; color:#1f497d">
<p><span><img moz-do-not-send="true" id="Bild_x0020_2"
alt="ETOGAS Image"
src="http://www.etogas.com/logo/etogas-logo.jpg"
height="36" border="0" width="200">
</span><span style="font-family:; color:#1f497d"><br>
</span></p>
<a moz-do-not-send="true" href="http://www.etogas.com/">
<span style="color:blue; \
font-size:8pt">http://www.etogas.com</span></a></span> <p><b>ETOGAS GmbH</b></p>
<p><span style="font-family:; color:#ff0000">Achtung: SolarFuel
GmbH heißt jetzt ETOGAS GmbH. Bitte beachten Sie unsere neuen
e-mail-Adressen und unsere neue Internetadresse. Darüber
hinaus ändern sich keine Kontaktdaten.
</span></p>
<span style="font-family:; color:#1f497d">Industriestraße 6,
D-70565 Stuttgart<br>
Geschäftsführung: Dipl.-Ing. Gregor Waldstein, MBA | Dipl.-Ing.
Dr. oec. HSG Karl Maria Grünauer
<span style="font-family:; color:#1f497d; font-size:7pt"><br>
Registergericht: Amtsgericht Stuttgart<br>
Handelsregister Nr.: HRB 733792<br>
Steuernummer: 99065/08453
<hr align="center" size="2" width="100%">
</span><span style="font-family:; color:#1f497d; font-size:7pt">USt-IdNr.:
DE 27 216 66 37 Commerzbank AG, BLZ 600 800 00, KontoNr. 0902
1048 00<br>
BIC: DRES DE FF 600, IBAN: DE78 6008 0000 0902 1048 00</span>
<div style="text-align:center" align="center"><span
style="font-family:; color:#1f497d; font-size:7pt">
<hr align="center" size="2" width="100%">
</span></div>
<span style="font-family:; color:#1f497d; font-size:7pt">D-U-N-S®
Nummer: 341629227</span>
</span>
<br>
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</pre>
</blockquote>
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
-----------------------------------------------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles, France
Phone: +33.1.80.77.04.68
<a class="moz-txt-link-freetext" \
href="http://www.scilab-enterprises.com">http://www.scilab-enterprises.com</a></pre> \
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