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<div class="moz-cite-prefix">Le 29/01/2019 à 16:45, Carrico, Paul a
écrit :<br>
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<p class="MsoNormal"><span lang="EN-US">Dear All<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">I spent some time in
looking for a mistake in my code ; finally I’ve found that
the ACOS of a real vector leads to some complex values (???)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<pre><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:#32B9B9" lang="ES">acos</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:#4A55DB" lang="ES">(</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:black" lang="ES">Scar_P</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:#4A55DB" lang="ES">(</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:#FFAA00" lang="ES">:</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:black" lang="ES">,</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:rosybrown" lang="ES">1</span><span style="font-size:12.0pt;font-family:"Monospaced","serif";color:#4A55DB" lang="ES">)</span><span style="font-size:12.0pt;font-family:"Monospaced","serif"" lang="ES"> <span style="color:#5C5C5C">./</span> <span style="color:black">CM_x_CN</span><span style="color:#4A55DB">(</span><span style="color:#FFAA00">:</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">))</span></span></pre>
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<p>Are your really sure, because we may have</p>
<p>--> x=-1-%eps <br>
x = <br>
<br>
-1.<br>
<br>
<br>
--> acos(x)<br>
ans =<br>
<br>
3.1415927 - 2.107D-08i</p>
<p>S.<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:3A6B7233274DB449A2A0053A47684F953FF1DAE6@BGS-EX01.auxitrol.ad">
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<pre><span style="font-size:12.0pt;font-family:"Monospaced","serif"" lang="ES"><span style="color:#4A55DB"><o:p></o:p></span></span></pre>
<pre><span style="font-size:12.0pt;font-family:"Monospaced","serif"" lang="ES"><o:p> </o:p></span></pre>
<p class="MsoNormal"><span lang="EN-US">(the formula worked so
far)<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I checked that the input
values are correct:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Comprised
between [-1; 1] using MIN and MAX<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Composed
only of real values using ISREAL (all the vectors are
correct)<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">Thus I do not understand
why complex values appear ?<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">May it come from the
vectorization ?<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<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"><o:p> </o:p></span></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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