Dear Samuel,<div><br></div><div>thanks for your quick answer. The following lines solve the heat equation and provides </div><div> a smooth evolution for the plot. SCILAB 5.4.0 does not like it.</div><div><br></div><div>thanks,</div><div><br></div><div>eliseo</div><div><br></div><div><pre style="font-family:Monospaced;font-style:normal;font-size:18.0;"><span style="color:rgb(1,168,1);font-style:italic;">///</span>
<span style="color:rgb(1,168,1);font-style:italic;">// heat equation</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(50,185,185);">clear</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(1,168,1);font-style:italic;">// Initial value</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(176,24,19);">function</span> <span style="color:rgb(131,67,16);font-weight:bold;">z</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);text-decoration:underline;">u0</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(131,67,16);font-weight:bold;">xx</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(160,32,240);">if</span> <span style="color:rgb(74,85,219);">(</span><span style="color:rgb(50,185,185);">abs</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(131,67,16);font-weight:bold;">xx</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);"><=</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span> <span style="color:rgb(160,32,240);">then</span>
<span style="color:rgb(131,67,16);font-weight:bold;">z</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(160,32,240);">else</span>
<span style="color:rgb(131,67,16);font-weight:bold;">z</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">0</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(160,32,240);">end</span>
<span style="color:rgb(176,24,19);">endfunction</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(1,168,1);font-style:italic;">// b heat coef.</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(0,0,0);">b</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">f0</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(174,92,176);text-decoration:underline;">scf</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">0</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">f0</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">pixmap</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">'</span><span style="color:rgb(188,143,143);">on</span><span style="color:rgb(188,143,143);">'</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(174,92,176);text-decoration:underline;">clf</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">f0</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(50,185,185);">show_window</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(1,168,1);font-style:italic;">// space interval</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(0,0,0);">xmin</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(92,92,92);">-</span><span style="color:rgb(188,143,143);">5</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">xmax</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">5</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">125</span><span style="color:rgb(0,0,0);">;</span> <span style="color:rgb(1,168,1);font-style:italic;">// Number of points</span>
<span style="color:rgb(0,0,0);">h</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">xmax</span><span style="color:rgb(92,92,92);">-</span><span style="color:rgb(0,0,0);">xmin</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">/</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">x</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);">xmin</span><span style="color:rgb(255,170,0);">:</span><span style="color:rgb(0,0,0);">h</span><span style="color:rgb(255,170,0);">:</span><span style="color:rgb(0,0,0);">xmax</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(0,0,0);">u</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">zeros</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">uold</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">zeros</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">u2</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">zeros</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span> <span style="color:rgb(1,168,1);font-style:italic;">// dimensionamos inicialmente a cero</span>
<span style="color:rgb(0,0,0);">uold2</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">zeros</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">ucero</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(50,185,185);">zeros</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(1,168,1);font-style:italic;">// time</span>
<span style="color:rgb(1,168,1);font-style:italic;">//</span>
<span style="color:rgb(0,0,0);">t0</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">0</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">time</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);">t0</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(160,32,240);">for</span> <span style="color:rgb(0,0,0);">i</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(255,170,0);">:</span><span style="color:rgb(0,0,0);">Nx</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span>
<span style="color:rgb(0,0,0);">uold</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);text-decoration:underline;">u0</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span> <span style="color:rgb(1,168,1);font-style:italic;">// initial value</span>
<span style="color:rgb(0,0,0);">uold2</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);text-decoration:underline;">u0</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">ucero</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(0,0,0);text-decoration:underline;">u0</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">i</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(160,32,240);">end</span>
<span style="color:rgb(174,92,176);text-decoration:underline;">plot</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(0,0,0);">uold</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(188,143,143);">'</span><span style="color:rgb(188,143,143);">dr</span><span style="color:rgb(188,143,143);">'</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(0,0,0);">ejes</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(174,92,176);text-decoration:underline;">gca</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span> </pre><pre style="font-family:Monospaced;font-style:normal;font-size:18.0;"><span style="color:rgb(0,0,0);">ejes</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">data_bounds</span><span style="color:rgb(92,92,92);">=</span><span style="color:rgb(74,85,219);">[</span><span style="color:rgb(0,0,0);">xmin</span><span style="color:rgb(0,0,0);">,</span> <span style="color:rgb(188,143,143);">0</span><span style="color:rgb(0,0,0);">;</span> <span style="color:rgb(0,0,0);">xmax</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(188,143,143);">1.2</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(0,0,0);">;</span></pre><pre style="font-family: Monospaced; font-size: 18px; "><span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">title</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span class="Apple-style-span" style="font-style: normal; color: rgb(188, 143, 143); ">" <span class="Apple-style-span" style="color: rgb(0, 0, 0); "><span style="color:rgb(74,85,219);">Initial data </span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span></span><br></span><span style="font-style: normal; color: rgb(50, 185, 185); ">show_pixmap</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(50, 185, 185); ">sleep</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(10</span><span style="font-style: normal; color: rgb(188, 143, 143); ">00</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">k</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">0.9</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">h</span><span style="font-style: normal; color: rgb(92, 92, 92); ">^</span><span style="font-style: normal; color: rgb(188, 143, 143); ">2</span><span style="font-style: normal; color: rgb(92, 92, 92); ">/</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(188, 143, 143); ">2</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">b</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;// stability</span>
<span style="color: rgb(1, 168, 1); font-style: italic; ">//</span>
<span style="color: rgb(1, 168, 1); font-style: italic; ">// coeficiente mu=k/h^2</span>
<span style="color: rgb(1, 168, 1); font-style: italic; ">//</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">mu</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">k</span><span style="font-style: normal; color: rgb(92, 92, 92); ">/</span><span style="font-style: normal; color: rgb(0, 0, 0); ">h</span><span style="font-style: normal; color: rgb(92, 92, 92); ">^</span><span style="font-style: normal; color: rgb(188, 143, 143); ">2</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="color: rgb(1, 168, 1); font-style: italic; ">// </span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">coef1</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">b</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">mu</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">coef2</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(92, 92, 92); ">-</span><span style="font-style: normal; color: rgb(188, 143, 143); ">2</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">b</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">mu</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">coef3</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">b</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">mu</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="color: rgb(1, 168, 1); font-style: italic; ">//</span>
<span style="font-style: normal; color: rgb(160, 32, 240); ">while</span> <span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">time</span><span style="font-style: normal; color: rgb(92, 92, 92); "><</span><span style="font-style: normal; color: rgb(188, 143, 143); ">0.5</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">time</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">time</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(0, 0, 0); ">k</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">u</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">0</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">u</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">Nx</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">0</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(160, 32, 240); ">for</span> <span style="font-style: normal; color: rgb(0, 0, 0); ">i</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">2</span><span style="font-style: normal; color: rgb(255, 170, 0); ">:</span><span style="font-style: normal; color: rgb(0, 0, 0); ">Nx</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">u</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">i</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">coef1</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">uold</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">i</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(0, 0, 0); ">coef2</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">uold</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">i</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(0, 0, 0); ">coef3</span><span style="font-style: normal; color: rgb(92, 92, 92); ">*</span><span style="font-style: normal; color: rgb(0, 0, 0); ">uold</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">i</span><span style="font-style: normal; color: rgb(92, 92, 92); ">-</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(160, 32, 240); ">end</span>
<span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">clf</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">f0</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">plot</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">x</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(0, 0, 0); ">u</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(188, 143, 143); ">or</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(0, 0, 0); ">x</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(0, 0, 0); ">ucero</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(188, 143, 143); ">db</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">ejes</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">gca</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">ejes</span><span style="font-style: normal; color: rgb(92, 92, 92); ">.</span><span style="font-style: normal; color: rgb(170, 170, 170); ">data_bounds</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(74, 85, 219); ">[</span><span style="font-style: normal; color: rgb(0, 0, 0); ">xmin</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span> <span style="font-style: normal; color: rgb(188, 143, 143); ">0</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span> <span style="font-style: normal; color: rgb(0, 0, 0); ">xmax</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1.2</span><span style="font-style: normal; color: rgb(74, 85, 219); ">]</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">title</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(188, 143, 143); ">Euler explicit: time= </span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(50, 185, 185); ">string</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">time</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(255, 170, 0); ">..</span>
<span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(188, 143, 143); ">; time step = </span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(50, 185, 185); ">string</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">k</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(255, 170, 0); ">..</span>
<span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(188, 143, 143); ">; spatial h=</span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(50, 185, 185); ">string</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">h</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(188, 143, 143); ">; diffusion = </span><span style="font-style: normal; color: rgb(188, 143, 143); ">"</span><span style="font-style: normal; color: rgb(92, 92, 92); ">+</span><span style="font-style: normal; color: rgb(50, 185, 185); ">string</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(0, 0, 0); ">b</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(174, 92, 176); text-decoration: underline; ">legend</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(188, 143, 143); ">b=1</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(0, 0, 0); ">,</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(188, 143, 143); ">initial</span><span style="font-style: normal; color: rgb(188, 143, 143); ">'</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(50, 185, 185); ">show_pixmap</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(0, 0, 0); ">uold</span><span style="font-style: normal; color: rgb(92, 92, 92); ">=</span><span style="font-style: normal; color: rgb(0, 0, 0); ">u</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(50, 185, 185); ">sleep</span><span style="font-style: normal; color: rgb(74, 85, 219); ">(</span><span style="font-style: normal; color: rgb(188, 143, 143); ">1</span><span style="font-style: normal; color: rgb(74, 85, 219); ">)</span><span style="font-style: normal; color: rgb(0, 0, 0); ">;</span>
<span style="font-style: normal; color: rgb(160, 32, 240); ">end</span>
</pre><div>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "> Saludos,</span></div><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><br> Eliseo Chacon Vera <br> Departamento de Matemáticas <br> Facultad de Matematicas. Universidad de Murcia <span class="Apple-converted-space"> </span><span class="Apple-converted-space"></span></span></div><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "> Postal Address: Campus de Espinardo, 30100-Espinardo-Murcia <br> Phone: (34) 868 884175 fax: (34) 868 88</span>4182 <span class="Apple-converted-space"> </span><span class="Apple-converted-space"></span></div></div></span></div></span></div></span></div></span></div><div> email: <a href="/user/SendEmail.jtp?type=node&node=4025184&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a> </div><div><br></div> Freefem Wiki: <a href="http://www.um.es/freefem/ff++/pmwiki.php" target="_top" rel="nofollow" link="external">http://www.um.es/freefem/ff++/pmwiki.php</a><span class="Apple-style-span" style="border-collapse: separate; 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</div>
<br><div><div>El 08/11/2012, a las 20:01, Samuel GOUGEON [via Scilab / Xcos - Mailing Lists Archives] escribió:</div><br class="Apple-interchange-newline"><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' type="cite">
Le 08/11/2012 17:59, Eliseo Chacon Vera a écrit :
<br>> could anyone give me one?? I can't do it with the drawnow/drawlater option.
<br>Why not? It's difficult to help you more without knowing the code of
<br>your temptative...
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