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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks all <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Indeed, getting the complete block works fine and it’s instantaneous<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Paul<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">De :</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:FR">
users [mailto:users-bounces@lists.scilab.org] <b>De la part de</b> Stéphane Mottelet<br>
<b>Envoyé :</b> mardi 30 avril 2019 12:41<br>
<b>À :</b> users@lists.scilab.org<br>
<b>Objet :</b> [EXTERNAL] Re: [Scilab-users] feedback on removing 1 row and 1 column<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Le 30/04/2019 à 08:44, Carrico, Paul a écrit :<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<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.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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 lang="EN-US" style="font-family:Wingdings">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:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">MAT(1,:) = []; MAT(:,$) = [];</span><o:p></o:p></p>
</blockquote>
<p>in the meantime (before we fix this), you can do<o:p></o:p></p>
<p><span lang="EN-US">MAT = MAT(:,1:$-1);</span><o:p></o:p></p>
<p><span lang="EN-US">which will be way faster !</span><o:p></o:p></p>
<p><span lang="EN-US">S.</span><o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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).</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">A feedback I wanted to share ….</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></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"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:FR"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>users mailing list<o:p></o:p></pre>
<pre><a href="mailto:users@lists.scilab.org">users@lists.scilab.org</a><o:p></o:p></pre>
<pre><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__antispam.utc.fr_proxy_1_c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy_lists.scilab.org_mailman_listinfo_users&d=DwMD-g&c=0hKVUfnuoBozYN8UvxPA-w&r=2R_Eyw3woK4XVPnEug_8oZFQfCE8Ul6UYufxQizYx6k&m=8u_kv9vrBYRsyNeOuOx1-8PC4J3mnOk3lTxHZb9M1Ag&s=3ChVco-XbUA6A2leK09txfCP6iuWYrDHPV0kJQ_fNRo&e=">https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users</a><o:p></o:p></pre>
</blockquote>
<p><o:p> </o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Stéphane Mottelet<o:p></o:p></pre>
<pre>Ingénieur de recherche<o:p></o:p></pre>
<pre>EA 4297 Transformations Intégrées de la Matière Renouvelable<o:p></o:p></pre>
<pre>Département Génie des Procédés Industriels<o:p></o:p></pre>
<pre>Sorbonne Universités - Université de Technologie de Compiègne<o:p></o:p></pre>
<pre>CS 60319, 60203 Compiègne cedex<o:p></o:p></pre>
<pre>Tel : +33(0)344234688<o:p></o:p></pre>
<pre><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.utc.fr_-7Emottelet&d=DwMD-g&c=0hKVUfnuoBozYN8UvxPA-w&r=2R_Eyw3woK4XVPnEug_8oZFQfCE8Ul6UYufxQizYx6k&m=8u_kv9vrBYRsyNeOuOx1-8PC4J3mnOk3lTxHZb9M1Ag&s=lgW8LxCQDNlDkDXz_laFa3r_BQoToZw3IAT2XDiJNf0&e=">http://www.utc.fr/~mottelet</a><o:p></o:p></pre>
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