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<p>Hello all,</p>
<p>I might have found a workaround, but I still need to ensure that
I get exactly the same end results in my code.<br>
It seems that I can replace:<br>
</p>
<p><tt>[W2, gammas] = spec(A); //crashes</tt><br>
</p>
<p>by<br>
</p>
<p><tt>[al,be,W2]=spec(A,eye(A)); //fine</tt><tt><br>
</tt><tt>gammas=diag(al./be);</tt></p>
<p>If anyone has a solution with eigs, I'll take it.<br>
Could my workaround help investigate where the bug is in the
gateway between scilab and lapack?<br>
</p>
<p>Cheers,</p>
<p>Antoine<br>
</p>
<div class="moz-cite-prefix">On 05/05/2021 08:22, Antoine Monmayrant
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:416a2084-0a27-8604-595d-9c06defcb7a3@laas.fr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p><br>
</p>
<div class="moz-cite-prefix">On 05/05/2021 00:09, Samuel Gougeon
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5400650e-5666-83a1-1cbc-1c33d6a447b6@free.fr">
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charset=UTF-8">
<div class="moz-cite-prefix">Le 04/05/2021 à 16:38, Antoine
Monmayrant a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:aafebdc4-984b-85a2-01d1-bb03da0df598@laas.fr">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Yes, it does the same</p>
<p>So this bug is still a problem, at least on Ubuntu.<br>
Can you guys try to run spec.tst on his machine and comment
on <a class="moz-txt-link-freetext"
href="https://bugzilla.scilab.org/show_bug.cgi?id=15330"
moz-do-not-send="true">https://bugzilla.scilab.org/show_bug.cgi?id=15330</a>
?</p>
</blockquote>
<p><br>
</p>
</blockquote>
Hello Samuel,<br>
<blockquote type="cite"
cite="mid:5400650e-5666-83a1-1cbc-1c33d6a447b6@free.fr">
<p> </p>
<span class="VIiyi" style="display: inline; color: rgb(0, 0, 0); font-size: 18px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(245, 245, 245); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;" lang="en"><span class="JLqJ4b ChMk0b" data-language-for-alternatives="en" data-language-to-translate-into="fr" data-phrase-index="0" style="-webkit-tap-highlight-color: transparent; cursor: pointer;"><span style="-webkit-tap-highlight-color: transparent;">Besides, how confusing and messy the notations on the spec () documentation page are! ...</span></span></span><span style="color: rgb(0, 0, 0); font-size: 18px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(245, 245, 245); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"> </span><br>
<span style="color: rgb(0, 0, 0); font-size: 18px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(245, 245, 245); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span>
<ul>
<li>R defined twice but differently among arguments</li>
<li>L defined among arguments but not used in syntaxes</li>
<li>Q and Z used in syntaxes but not described among arguments</li>
<li>al, be used in descriptions, instead of alpha and beta
listed in arguments</li>
<li>E used in the description, but not in arguments nor in
syntaxes...</li>
</ul>
and so on.. <br>
In addition, notations differ from a language version to another
one...<br>
Some clarification is urgently required.<br>
</blockquote>
Indeed.<br>
It is also a big problem for portability to get such a basic
functionality (solving eigenvalue problems in a linear algebra
software!) only working on some platforms!<br>
<blockquote type="cite"
cite="mid:5400650e-5666-83a1-1cbc-1c33d6a447b6@free.fr"> <br>
In next release, eigs() -- mainly based on the former Arnoldi
module, that becomes internal -- is listed in the same help
section. Have you tried it?<br>
</blockquote>
Well, I might be a bit far from my field of expertise, but it does
not seem that eigs can compute all the eigenvalues/eigenvectors,
does it?<br>
It seems that by default it computes the 6 biggest ones and can go
up to rank(A)-2.<br>
<p>In my use case, I need all the eigenvalues...</p>
<p>Antoine<br>
</p>
<blockquote type="cite"
cite="mid:5400650e-5666-83a1-1cbc-1c33d6a447b6@free.fr"> <br>
Samuel<br>
<br>
<br>
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