<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<div class="moz-cite-prefix">I confirm the last example in <a
href="https://help.scilab.org/docs/6.1.0/en_US/bvode.html">https://help.scilab.org/docs/6.1.0/en_US/bvode.html</a>
returns the following error - on a Windows 10 machine:</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">-->
exec('D:\Userdata\Claus\Documents\Scilab\bvode_example.sce', -1)<br>
VERSION *COLNEW* OF COLSYS .<br>
THE MAXIMUM NUMBER OF SUBINTERVALS IS MIN ( 117 (ALLOWED FROM
FSPACE), 124 (ALLOWED FROM ISPACE) )<br>
THE NEW MESH (OF 4 SUBINTERVALS), 0.000000 0.500000
1.000000 1.450000 1.900000<br>
CONVERGENCE AFTER 3 ITERATIONS<br>
THE NEW MESH (OF 8 SUBINTERVALS), 0.000000 0.250000
0.500000 0.750000 1.000000 1.225000 1.450000
1.675000 1.900000<br>
CONVERGENCE AFTER 1 ITERATIONS<br>
VERSION *COLNEW* OF COLSYS .<br>
THE MAXIMUM NUMBER OF SUBINTERVALS IS MIN ( 117 (ALLOWED FROM
FSPACE), 124 (ALLOWED FROM ISPACE) )<br>
THE FORMER MESH (OF 4 SUBINTERVALS), 0.000000
0.000000 0.000000 0.000000 0.000000<br>
THE NEW MESH (OF 2 SUBINTERVALS), 0.000000 0.000000
1.900000<br>
****** DOMAIN ERROR IN APPROX ****** X = 0.2141331642D+00
ALEFT = 0.0000000000D+00 ARIGHT = 0.0000000000D+00<br>
****** DOMAIN ERROR IN APPROX ****** X = 0.9500000000D+00
ALEFT = 0.0000000000D+00 ARIGHT = 0.0000000000D+00<br>
****** DOMAIN ERROR IN APPROX ****** X = 0.1685866836D+01
ALEFT = 0.0000000000D+00 ARIGHT = 0.0000000000D+00<br>
THE GLOBAL BVP-MATRIX IS SINGULAR<br>
at line 122 of executed file
D:\Userdata\Claus\Documents\Scilab\bvode_example.sce<br>
<br>
bvode: The collocation matrix is singular.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">... Line 122 is of course the execution
of bvode:<span style="color:rgb(0,0,0);"><br>
</span></div>
<div class="moz-cite-prefix"><span style="color:rgb(0,0,0);"><br>
</span></div>
<div class="moz-cite-prefix"><span style="color:rgb(0,0,0);">sol</span><span
style="color:rgb(92,92,92);">=</span><span
style="color:rgb(0,0,0);">bvodex</span><span
style="color:rgb(92,92,92);">|</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(0,0,0);">res</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">ncomp</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">m</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">aleft</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">aright</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">zeta</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">ipar</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">ltol</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">tol</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">fixpnt</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(255,170,0);">...</span><br>
</div>
<div class="moz-cite-prefix"> <span style="color:rgb(0,0,0);">fsub</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">dfsub</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">gsub</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">dgsub</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(0,0,0);">guess</span><span
style="color:rgb(74,85,219);">)</span><span
style="color:rgb(0,0,0);">;</span><span
style="color:rgb(255,170,0);"></span></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">/Claus<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 15-07-2020 19:39, Rene Djack wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGRoO=RXJ05CZRpSgNhPpeUQSx5uPf9YKX-+6LVWwZBNdA1DvA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Hello,
<div dir="auto">I' m new to this list and to scilab too!</div>
<div dir="auto">Working on bvode, I try the example "Quantum
Neumann equation" found in the scilab help and i get the error
message</div>
<div dir="auto">"Collocation matrix is singular"</div>
<div dir="auto">Is this example broken?</div>
<div dir="auto">Somebody have the same message?</div>
<div dir="auto"><br>
</div>
<div dir="auto">I'm using scilab 6.10 from
scilab-6.10.bin.linux-x86-64.tar.gz on Ubuntu 20.4</div>
<div dir="auto"><br>
</div>
<div dir="auto">Tanks for reading</div>
<div dir="auto">Regards</div>
<div dir="auto"> </div>
<div dir="auto"><br>
</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="http://lists.scilab.org/mailman/listinfo/users">http://lists.scilab.org/mailman/listinfo/users</a>
</pre>
</blockquote>
<p><br>
</p>
</body>
</html>