<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>The system described in your EDOS.ps file can be written in
implicit form,</p>
<p>A*[dy1/dt; dy2/dt] = F(y1,y2)</p>
<p>but here you have A =[1 -1; -2 2], i.e. A is singular. I am not
sure that; at least under this form, your system is well-posed.</p>
<p>S.<br>
</p>
<div class="moz-cite-prefix">Le 08/04/2019 à 22:13, Marcus Vinicius
Pereira de Souza a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:1717815337.54310.1554754412869@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydpc0cadab4yahoo-style-wrap" style="font-family: times
new roman, new york, times, serif; font-size: 24px;">
<div><span>Dear all,</span></div>
<div><span style="color: rgb(33, 33, 33); font-family: Arial, sans-serif; font-size: 14pt; white-space: pre-wrap;">I'm trying to do a simulation involving a </span><span style="color: rgb(33, 33, 33); font-family: Arial, sans-serif; font-size: 14pt; white-space: pre-wrap;">system of ordinary differential equations. However, in working out the block </span><span style="color: rgb(33, 33, 33); font-family: Arial, sans-serif; font-size: 14pt; white-space: pre-wrap;">diagram, I came across an algebraic loop problem.</span><span>
<pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-family:inherit,serif;color:#212121;mso-ansi-language:EN" lang="EN"><span><pre style="white-space: pre-wrap; color: rgb(0, 0, 0); font-size: 24px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span><p class="ydpc0dc7c1MsoNormal" style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121"></span></p><pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121;mso-ansi-language:EN" lang="EN">To solve this problem, I made a new arrangement of the equations and then it was necessary to include a derivative block.</span><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121"></span></pre><pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121;mso-ansi-language:EN" lang="EN">Two new problems have appeared: 1) the initial value of the output signal does not match the value obtained by the initial value theorem and 2) the signal has a strong oscillation (probably due to high frequencies).</span><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121"></span></pre><pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121;mso-ansi-language:EN" lang="EN">Can anyone help me solve these issues? Attached, the. Thank you very much.</span><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121"></span></pre><pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-size:14.0pt;font-family:Arial,sans-serif;color:#212121;mso-ansi-language:EN" lang="EN">
</span></pre>
<p class="ydpc0dc7c1MsoNormal" style="text-align:justify"> </p></span>
</pre></span></span></pre>
<pre style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="font-family:inherit,serif;color:#212121;mso-ansi-language:EN" lang="EN">
</span></pre>
</span><br>
</div>
<div><br>
</div>
<div class="ydpc0cadab4signature">
<div style="font-family:garamond,;font-size:16px;"><font
size="1" face="verdana, helvetica, sans-serif">--<br>
</font>
<div class="ydpc5ca3d36gmail_signature">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr"><font size="1" face="verdana,
helvetica, sans-serif">Marcus Vinicius Pereira
de Souza, D.Sc. (Eng.)</font>
<div><font size="1" face="verdana, helvetica,
sans-serif">Prof. do Ens. Bas. Tec.
Tecnológico</font></div>
<div><font size="1" face="verdana, helvetica,
sans-serif">CEFET/RJ | Campus Valença-RJ<br>
Cel: +55 32 9 8436 9695 (TIM - Wapp)<br>
</font>
<div><a
href="https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lattes.cnpq.br/1549590151077934"
rel="nofollow" target="_blank"
moz-do-not-send="true"><i><font size="1"
face="verdana, helvetica, sans-serif">http://lattes.cnpq.br/1549590151077934</font></i></a><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:users@lists.scilab.org">users@lists.scilab.org</a>
<a class="moz-txt-link-freetext" href="https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users">https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users</a>
</pre>
</blockquote>
</body>
</html>