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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Bonjour,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>J’utilise Scilab depuis très peu de temps et je
rencontre un problème pour utiliser une fonction définie précédemment dans un
système d’équations.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Voici le cas :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Au début du modèle je définis la fonction Q_cyl2(t) par
interpolation linéaire à partir de quelques valeurs :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<pre><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600"
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absolute;z-index:-2;margin-left:438px;margin-top:6px;width:288px;height:193px'><img
width=288 height=193 src="cid:image004.jpg@01CDAC6E.DB8D6830" v:shapes="_x0000_s1026"></span><![endif]><i><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>temps </span></font></i><i><font size=2
color="#5c5c5c" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#5C5C5C;font-style:italic'>= </span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>[</span></font></i><i><font size=2
color=rosybrown face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:rosybrown;font-style:italic'>0</span></font></i><i><font size=2
face=Arial><span style='font-size:11.0pt;font-family:Arial;font-style:italic'> <font
color=black><span style='color:black'>t1</span></font> <font color=black><span
style='color:black'>t2</span></font> <font color=black><span style='color:black'>t3</span></font><font
color="#4a55db"><span style='color:#4A55DB'>]</span></font><font color=black><span
style='color:black'>;</span></font><o:p></o:p></span></font></i></pre><pre><i><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>Q_cyl </span></font></i><i><font size=2
color="#5c5c5c" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#5C5C5C;font-style:italic'>= </span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>[</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>q1</span></font></i><i><font size=2 face=Arial><span
style='font-size:11.0pt;font-family:Arial;font-style:italic'> <font
color=black><span style='color:black'>q2</span></font> <font color=black><span
style='color:black'>q2</span></font> <font color=rosybrown><span
style='color:rosybrown'>0</span></font><font color="#4a55db"><span
style='color:#4A55DB'>]</span></font><font color=black><span style='color:black'>;</span></font><o:p></o:p></span></font></i></pre><pre><i><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>Q_cyl2</span></font></i><i><font size=2
color="#5c5c5c" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#5C5C5C;font-style:italic'>=</span></font></i><i><font size=2
color="#ae5cb0" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#AE5CB0;font-style:italic'>interpln </span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>([</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>temps;Q_cyl</span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>]</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>,</span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>[</span></font></i><i><font size=2
color=rosybrown face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:rosybrown;font-style:italic'>0</span></font></i><i><font size=2
color="#ffaa00" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#FFAA00;font-style:italic'>:</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>dt</span></font></i><i><font size=2
color="#ffaa00" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#FFAA00;font-style:italic'>:</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>t3</span></font></i><i><font size=2
color="#4a55db" face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:#4A55DB;font-style:italic'>])</span></font></i><i><font size=2
color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black;font-style:italic'>;</span></font></i><i><font size=2 face=Arial><span
style='font-size:11.0pt;font-family:Arial;font-style:italic'><o:p></o:p></span></font></i></pre><pre><font
size=2 color="#32b9b9" face=Monospaced><span style='font-size:10.5pt;
font-family:Monospaced;color:#32B9B9'>plot2d</span></font><font size=2
color="#4a55db" face=Monospaced><span style='font-size:10.5pt;font-family:Monospaced;
color:#4A55DB'>((</span></font><font size=2 color=rosybrown face=Monospaced><span
style='font-size:10.5pt;font-family:Monospaced;color:rosybrown'>0</span></font><font
size=2 color="#ffaa00" face=Monospaced><span style='font-size:10.5pt;
font-family:Monospaced;color:#FFAA00'>:</span></font><font size=2
color=rosybrown face=Monospaced><span style='font-size:10.5pt;font-family:Monospaced;
color:rosybrown'>t3</span></font><font size=2 color="#4a55db" face=Monospaced><span
style='font-size:10.5pt;font-family:Monospaced;color:#4A55DB'>)</span></font><font
size=2 color=black face=Monospaced><span style='font-size:10.5pt;font-family:
Monospaced;color:black'>,Q_cyl2</span></font><font size=2 color="#4a55db"
face=Monospaced><span style='font-size:10.5pt;font-family:Monospaced;
color:#4A55DB'>)</span></font><font size=2 face=Arial><span style='font-size:
11.0pt;font-family:Arial'><o:p></o:p></span></font></pre>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>à cette étape j’obtiens bien la fonction
voulue (figure ci-contre) <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Un peu plus loin dans le modèle, je commence le
système :<o:p></o:p></span></font></p>
<pre><font size=3 color="#32b9b9" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#32B9B9'><o:p> </o:p></span></font></pre><pre><font
size=3 color="#32b9b9" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#32B9B9'>deff</span></font><font size=3
color="#4a55db" face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>(</span></font><font size=3 color=rosybrown face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:rosybrown'>'[r,ires]=P0res(t,y,yd)'</span></font><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>,</span></font><font size=3 color="#4a55db"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>[<o:p></o:p></span></font></pre><pre><font size=3 color="#4a55db"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>r(1) = .y(1) ….<o:p></o:p></span></font></pre><pre><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'>r(2)=<o:p></o:p></span></font></pre><pre><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'>….<o:p></o:p></span></font></pre><pre><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'> </span></font><font size=3 color=black
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:black'>r</span></font><font size=3 color="#4a55db" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#4A55DB'>(</span></font><font
size=3 color=rosybrown face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:rosybrown'>16</span></font><font size=3
color="#4a55db" face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>)</span></font><font size=3 color="#5c5c5c" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#5C5C5C'>=</span></font><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>y</span></font><font size=3 color="#4a55db"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>(</span></font><font size=3 color=rosybrown face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:rosybrown'>16</span></font><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'>)</span></font><font size=3
color="#5c5c5c" face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#5C5C5C'>-</span></font><font size=3 color=black face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:black'>Q_cyl2</span></font><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'>(</span></font><font size=3 color=black
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:black'>t</span></font><font size=3 color="#4a55db" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#4A55DB'>)</span></font><font
size=3 face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced'><o:p></o:p></span></font></pre><pre><font
size=2 color=rosybrown face=Monospaced><span style='font-size:10.5pt;
font-family:Monospaced;color:rosybrown'>…..<o:p></o:p></span></font></pre><pre><font
size=2 color=rosybrown face=Monospaced><span style='font-size:10.5pt;
font-family:Monospaced;color:rosybrown'><o:p> </o:p></span></font></pre><pre><font
size=3 color=rosybrown face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:rosybrown'>'ires=0'</span></font><font size=3
color="#4a55db" face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>])</span></font><font size=3 color=black face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:black'>;<o:p></o:p></span></font></pre><pre><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>t</span></font><font size=3 color="#5c5c5c"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#5C5C5C'>=</span></font><font size=3 color="#4a55db" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#4A55DB'>[</span></font><font
size=3 color=rosybrown face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:rosybrown'>0</span></font><font size=3
color="#ffaa00" face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#FFAA00'>:</span></font><font size=3 color=black face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:black'>dt</span></font><font
size=3 color="#ffaa00" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#FFAA00'>:</span></font><font size=3 color=black
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:black'>t3</span></font><font size=3 color="#4a55db" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#4A55DB'>]</span></font><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>;</span></font><font size=3 face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced'><o:p></o:p></span></font></pre><pre><!--[if gte vml 1]><v:shape
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margin-top:9.95pt;width:239.25pt;height:184.5pt;z-index:-1;
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absolute;z-index:-1;margin-left:710px;margin-top:13px;width:319px;height:246px'><img
width=319 height=246 src="cid:image005.jpg@01CDAC6E.DB8D6830" v:shapes="_x0000_s1027"></span><![endif]><font
size=3 face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced'><o:p></o:p></span></font></pre><pre><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>y</span></font><font size=3 color="#5c5c5c"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#5C5C5C'>=</span></font><font size=3 color="#32b9b9" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#32B9B9'>dassl</span></font><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'>([</span></font><font size=3 color=black
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:black'>y0,yd0</span></font><font size=3 color="#4a55db" face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:#4A55DB'>]</span></font><font
size=3 color=black face=Monospaced><span style='font-size:12.0pt;font-family:
Monospaced;color:black'>,t0,t,</span></font><u><font size=3 color="#ae5cb0"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#AE5CB0'>P0res</span></font></u><font size=3 color="#4a55db"
face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced;
color:#4A55DB'>)</span></font><font size=3 color=black face=Monospaced><span
style='font-size:12.0pt;font-family:Monospaced;color:black'>;</span></font><font
size=3 face=Monospaced><span style='font-size:12.0pt;font-family:Monospaced'><o:p></o:p></span></font></pre><pre><font
size=3 color="#4a55db" face=Monospaced><span style='font-size:12.0pt;
font-family:Monospaced;color:#4A55DB'><o:p> </o:p></span></font></pre>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Plusieurs problèmes se posent :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- j’ai d’abord l’erreur « index
invalide » apparement à cause de la valeur en 0. Je l’ai contourné
en intégrant « if (t<>0) » <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>dans l’expression de r(16).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- le fait d’utiliser « t » en argument de la
fonction ne marche pas non plus (« index invalide »).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>J’ai donc introduit un autre vecteur i=</span></font><font
color="#4a55db" face=Monospaced><span style='font-family:Monospaced;color:#4A55DB'>[</span></font><font
color=rosybrown face=Monospaced><span style='font-family:Monospaced;color:rosybrown'>0</span></font><font
color="#ffaa00" face=Monospaced><span style='font-family:Monospaced;color:#FFAA00'>:</span></font><font
color=black face=Monospaced><span style='font-family:Monospaced;color:black'>dt</span></font><font
color="#ffaa00" face=Monospaced><span style='font-family:Monospaced;color:#FFAA00'>:</span></font><font
color=black face=Monospaced><span style='font-family:Monospaced;color:black'>t3</span></font><font
color=blue face=Monospaced><span style='font-family:Monospaced;color:blue'>]</span></font><font
color=black face=Monospaced><span style='font-family:Monospaced;color:black'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>donc
totalement identique à t. <o:p></o:p></span></font></p>
<pre><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>l’expression finale est donc : « </span></font><font
size=3 color=rosybrown face=Arial><span style='font-size:12.0pt;font-family:
Arial;color:rosybrown'>'if(i<>0);r(16)=y(16)-Q_cyl2(i);else;r(16)=y(16)-2.613;end' »</span></font><font
size=2 face=Monospaced><span style='font-size:10.5pt;font-family:Monospaced'><o:p></o:p></span></font></pre>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Là le calcul tourne, mais quand j’affiche la grandeur
y(16) , je ne récupère pas la bonne fonction, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>mais seulement la valeur initiale quelque soit t. (figure
ci-contre)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Pourriez-vous m’éclairer sur ce problème ?
N’hésitez pas bien sûr si il manque des précisions. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Merci d’avance. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cordialement,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><strong><b><i><font size=3 color="#0080c0"
face="Times New Roman"><span style='font-size:12.0pt;color:#0080C0;font-style:
italic'>Cécile KOCHER</span></font></i></b></strong><o:p></o:p></p>
<p class=MsoNormal><strong><b><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'>AREVA NP Lyon</span></font></i></b></strong><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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