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<div class="moz-cite-prefix">Le 30/04/2019 à 08:44, Carrico, Paul a
écrit :<br>
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<p class="MsoNormal">Dear All<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’ve been using
successfully Scilab for years, to develop my projects; I do
not remember if I’ve ever had to deal with huge matrixes but
that’s the case today.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Using “csvRead”, I got a
matrix with 2.3 million of rows and 6 columns (it took about
240 seconds to read it
</span><span style="font-family:Wingdings" lang="EN-US">J</span><span
lang="EN-US">); nevertheless I’ve been surprised when I
tried to remove the first row and the last column using
basically:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">MAT(1,:) = []; MAT(:,$)
= [];</span></p>
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<p>in the meantime (before we fix this), you can do</p>
<p><span lang="EN-US">MAT = MAT(:,1:$-1);</span></p>
<p><span lang="EN-US">which will be way faster !</span></p>
<p><span lang="EN-US">S.<br>
</span></p>
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cite="mid:3A6B7233274DB449A2A0053A47684F953FF90F92@BGS-EX01.auxitrol.ad">
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<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Indeed I needed to kill
the process after about 10 minutes (same result both under
Windows 10 and Linux – RAM not fully used).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">By comparison, the same
process is instantaneous under Python using Numpy
(numpy.delete) using of course the same matrix.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">A feedback I wanted to
share ….<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Paul</span>EXPORT
CONTROL : <o:p></o:p></p>
<p class="MsoNormal">« Cet email ne contient pas de données
techniques »<o:p></o:p></p>
<p class="MsoNormal">« This email does not contain technical
data » <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<pre class="moz-signature" cols="72">--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
<a class="moz-txt-link-freetext" href="http://www.utc.fr/~mottelet">http://www.utc.fr/~mottelet</a></pre>
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