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<p class="MsoNormal">Merci Stéphane, for the very interesting code and Heinz for the reference to the math behind the epidemy “curve”, or one of its models.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="color:#002060"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> users <users-bounces@lists.scilab.org> <b>On Behalf Of
</b>Stéphane Mottelet<br>
<b>Sent:</b> Monday, March 30, 2020 9:14 AM<br>
<b>To:</b> users@lists.scilab.org<br>
<b>Subject:</b> Re: [Scilab-users] Corona modelling<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hello Heinz,<o:p></o:p></p>
<p>Here is an interactive version (made for my children last week...) :<o:p></o:p></p>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><i><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#64AE64">// Confinement COVID-19 !</span></i><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><i><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#64AE64">// Stephane MOTTELET, UTC</span></i><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><i><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#64AE64">// Tue Mar 24 08:55:03 CET 2020</span></i><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><i><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#64AE64">// </span></i><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#B01813">function</span><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">dydt</span></b><span style="color:#5C5C5C">=</span><u><span style="color:black">sir</span></u><span style="color:#4A55DB">(</span><b><span style="color:#834310">t</span></b><span style="color:black">, </span><b><span style="color:#834310">y</span></b><span style="color:black">, </span><b><span style="color:#834310">bet</span></b><span style="color:black">, </span><b><span style="color:#834310">gam</span></b><span style="color:black">, </span><b><span style="color:#834310">N</span></b><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">dydt</span></b><span style="color:#5C5C5C">=</span><span style="color:#4A55DB">[</span><span style="color:#5C5C5C">-</span><b><span style="color:#834310">bet</span></b><span style="color:#5C5C5C">/</span><b><span style="color:#834310">N</span></b><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">bet</span></b><span style="color:#5C5C5C">/</span><b><span style="color:#834310">N</span></b><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">-</span><b><span style="color:#834310">gam</span></b><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">gam</span></b><span style="color:#5C5C5C">*</span><b><span style="color:#834310">y</span></b><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)]</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#B01813">endfunction</span><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#B01813">function</span><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <u><span style="color:black">draw</span></u><span style="color:#4A55DB">(</span><b><span style="color:#834310">bet</span></b><span style="color:black">, </span><b><span style="color:#834310">gam</span></b><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">t</span><span style="color:#5C5C5C">=</span><span style="color:rosybrown">0</span><span style="color:#FFAA00">:</span><span style="color:rosybrown">1</span><span style="color:#FFAA00">:</span><span style="color:rosybrown">360</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">N</span><span style="color:#5C5C5C">=</span><span style="color:rosybrown">6e7</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">if</span> <span style="color:#32B9B9">exists</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"gcbo"</span><span style="color:#4A55DB">)</span> <span style="color:#5C5C5C">&&</span> <span style="color:#32B9B9">is_handle_valid</span><span style="color:#4A55DB">(</span><span style="color:black">gcbo</span><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">sb</span> <span style="color:#5C5C5C">=</span> <span style="color:black">gcbo;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">if</span> <span style="color:black">sb</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">tag</span><span style="color:#5C5C5C">==</span><span style="color:rosybrown">"beta"</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">bet</span></b><span style="color:#5C5C5C">=</span><span style="color:black">sb</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">value</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">gam</span></b><span style="color:#5C5C5C">=</span><span style="color:black">findobj</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"gamma"</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">value</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">else</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">gam</span></b><span style="color:#5C5C5C">=</span><span style="color:black">sb</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">value</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <b><span style="color:#834310">bet</span></b><span style="color:#5C5C5C">=</span><span style="color:black">findobj</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"beta"</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">value</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">end</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">y</span><span style="color:#5C5C5C">=</span><span style="color:#32B9B9">ode</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">'stiff'</span><span style="color:black">,</span><span style="color:#4A55DB">[</span><span style="color:black">N</span><span style="color:#5C5C5C">-</span><span style="color:rosybrown">1</span><span style="color:black">;</span><span style="color:rosybrown">1</span><span style="color:black">;</span><span style="color:rosybrown">0</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:rosybrown">0</span><span style="color:black">,t,</span><span style="color:#32B9B9">list</span><span style="color:#4A55DB">(</span><u><span style="color:black">sir</span></u><span style="color:black">,</span><b><span style="color:#834310">bet</span></b><span style="color:black">,</span><b><span style="color:#834310">gam</span></b><span style="color:black">,N</span><span style="color:#4A55DB">))</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">curves</span> <span style="color:#5C5C5C">=</span> <span style="color:black">findobj</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"curves"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">curves</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">children</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">data</span><span style="color:#4A55DB">(</span><span style="color:#FFAA00">:</span><span style="color:black">,</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">=</span><span style="color:black">y</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">3</span><span style="color:black">,</span><span style="color:#FFAA00">:</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">curves</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">children</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">data</span><span style="color:#4A55DB">(</span><span style="color:#FFAA00">:</span><span style="color:black">,</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">=</span><span style="color:black">y</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">2</span><span style="color:black">,</span><span style="color:#FFAA00">:</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">curves</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">children</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">3</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">data</span><span style="color:#4A55DB">(</span><span style="color:#FFAA00">:</span><span style="color:black">,</span><span style="color:rosybrown">2</span><span style="color:#4A55DB">)</span><span style="color:#5C5C5C">=</span><span style="color:black">y</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:#FFAA00">:</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">else</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">y</span><span style="color:#5C5C5C">=</span><span style="color:#32B9B9">ode</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">'stiff'</span><span style="color:black">,</span><span style="color:#4A55DB">[</span><span style="color:black">N</span><span style="color:#5C5C5C">-</span><span style="color:rosybrown">1</span><span style="color:black">;</span><span style="color:rosybrown">1</span><span style="color:black">;</span><span style="color:rosybrown">0</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:rosybrown">0</span><span style="color:black">,t,</span><span style="color:#32B9B9">list</span><span style="color:#4A55DB">(</span><u><span style="color:black">sir</span></u><span style="color:black">,</span><b><span style="color:#834310">bet</span></b><span style="color:black">,</span><b><span style="color:#834310">gam</span></b><span style="color:black">,N</span><span style="color:#4A55DB">))</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">scf</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">0</span><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">clf</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">plot</span><span style="color:#4A55DB">(</span><span style="color:black">t,y</span><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">gce</span><span style="color:#4A55DB">()</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">tag</span><span style="color:#5C5C5C">=</span><span style="color:rosybrown">"curves"</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">gce</span><span style="color:#4A55DB">()</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">children</span><span style="color:#5C5C5C">.</span><span style="color:#AAAAAA">thickness</span><span style="color:#5C5C5C">=</span><span style="color:rosybrown">2</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">legend</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"Susceptible"</span><span style="color:black">,</span><span style="color:rosybrown">"Infected"</span><span style="color:black">,</span><span style="color:rosybrown">"Recovered"</span><span style="color:black">,</span><span style="color:#5C5C5C">-</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">sb1</span> <span style="color:#5C5C5C">=</span> <span style="color:#32B9B9">uicontrol</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"style"</span><span style="color:black">,</span><span style="color:rosybrown">"slider"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"units"</span><span style="color:black">,</span><span style="color:rosybrown">"normalized"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Position"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">0.85</span><span style="color:black">,</span><span style="color:rosybrown">0.2</span><span style="color:black">,</span><span style="color:rosybrown">0.05</span><span style="color:black">,</span><span style="color:rosybrown">0.48</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"BackgroundColor"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Callback_Type"</span><span style="color:black">,</span><span style="color:rosybrown">12</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"sliderstep"</span><span style="color:black">,</span><span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:#5C5C5C">/</span><span style="color:rosybrown">1000</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#5C5C5C">/</span><span style="color:rosybrown">10</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"min"</span><span style="color:black">,</span><span style="color:rosybrown">0.15</span><span style="color:black">,</span><span style="color:rosybrown">"max"</span><span style="color:black">,</span><span style="color:rosybrown">0.3</span><span style="color:black">,</span><span style="color:rosybrown">"value"</span><span style="color:black">,</span><b><span style="color:#834310">bet</span></b><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Callback"</span><span style="color:black">,</span><span style="color:rosybrown">"draw"</span><span style="color:black">,</span><span style="color:rosybrown">"tag"</span><span style="color:black">,</span><span style="color:rosybrown">"beta"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#32B9B9">uicontrol</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"style"</span><span style="color:black">,</span><span style="color:rosybrown">"text"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"string"</span><span style="color:black">,</span><span style="color:rosybrown">"$\beta$"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"units"</span><span style="color:black">,</span><span style="color:rosybrown">"normalized"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Position"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">0.85</span><span style="color:black">,</span><span style="color:rosybrown">0.125</span><span style="color:black">,</span><span style="color:rosybrown">0.05</span><span style="color:black">,</span><span style="color:rosybrown">0.08</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"BackgroundColor"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"HorizontalAlignment"</span><span style="color:black">,</span><span style="color:rosybrown">"center"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:black">sb1</span> <span style="color:#5C5C5C">=</span> <span style="color:#32B9B9">uicontrol</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"style"</span><span style="color:black">,</span><span style="color:rosybrown">"slider"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"units"</span><span style="color:black">,</span><span style="color:rosybrown">"normalized"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Position"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">0.90</span><span style="color:black">,</span><span style="color:rosybrown">0.2</span><span style="color:black">,</span><span style="color:rosybrown">0.05</span><span style="color:black">,</span><span style="color:rosybrown">0.48</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"BackgroundColor"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Callback_Type"</span><span style="color:black">,</span><span style="color:rosybrown">12</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"sliderstep"</span><span style="color:black">,</span><span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:#5C5C5C">/</span><span style="color:rosybrown">1000</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#5C5C5C">/</span><span style="color:rosybrown">10</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"min"</span><span style="color:black">,</span><span style="color:rosybrown">0</span><span style="color:black">,</span><span style="color:rosybrown">"max"</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#5C5C5C">/</span><span style="color:rosybrown">15</span><span style="color:black">,</span><span style="color:rosybrown">"value"</span><span style="color:black">,</span><b><span style="color:#834310">gam</span></b><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Callback"</span><span style="color:black">,</span><span style="color:rosybrown">"draw"</span><span style="color:black">,</span><span style="color:rosybrown">"tag"</span><span style="color:black">,</span><span style="color:rosybrown">"gamma"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#32B9B9">uicontrol</span><span style="color:#4A55DB">(</span><span style="color:rosybrown">"style"</span><span style="color:black">,</span><span style="color:rosybrown">"text"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"string"</span><span style="color:black">,</span><span style="color:rosybrown">"$\gamma$"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"units"</span><span style="color:black">,</span><span style="color:rosybrown">"normalized"</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"Position"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">0.9</span><span style="color:black">,</span><span style="color:rosybrown">0.125</span><span style="color:black">,</span><span style="color:rosybrown">0.05</span><span style="color:black">,</span><span style="color:rosybrown">0.08</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"BackgroundColor"</span><span style="color:black">,</span> <span style="color:#4A55DB">[</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:black">,</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">]</span><span style="color:black">,</span><span style="color:#FFAA00">...</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:rosybrown">"HorizontalAlignment"</span><span style="color:black">,</span><span style="color:rosybrown">"center"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span> <o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"> <span style="color:#A020F0">end</span><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#A020F0">end</span><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:black">clf</span><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif"><o:p> </o:p></span></pre>
<pre><u><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:black">draw</span></u><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#4A55DB">(</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:rosybrown">0.3</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:black">,</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:rosybrown">1</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#5C5C5C">/</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:rosybrown">15</span><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#4A55DB">)<o:p></o:p></span></pre>
<pre><span style="font-size:11.5pt;font-family:"Monospaced",serif;color:#4A55DB"><o:p> </o:p></span></pre>
<div>
<p class="MsoNormal">Le 30/03/2020 à 02:14, Heinz Nabielek a écrit :<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre>Colleagues:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>is there an straightforward Scilab approach for solving the three coupled nonlinear differential equations of first order given by the Standard Model of Epidemics?<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>S= number Susceptible: S'=-aSI<o:p></o:p></pre>
<pre>I= number Infected: I'=aSI - bI<o:p></o:p></pre>
<pre>R= number Recovered: R'=bI<o:p></o:p></pre>
<pre>whereby 'a' is the transmission coefficient, 'b' the recovery factor (after Reed-Frost 1928).<o:p></o:p></pre>
<pre>Initial values for S, I, R are available.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Thank you<o:p></o:p></pre>
<pre>Heinz<o:p></o:p></pre>
<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://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users">https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users</a><o:p></o:p></pre>
</blockquote>
<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="http://www.utc.fr/~mottelet">http://www.utc.fr/~mottelet</a><o:p></o:p></pre>
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