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Hello,<br>
<br>
This problem has already been reported in bug 12028<br>
<br>
<a class="moz-txt-link-freetext" href="http://bugzilla.scilab.org/show_bug.cgi?id=12028">http://bugzilla.scilab.org/show_bug.cgi?id=12028</a><br>
<br>
The Scilab Team made a really good job in the 5.4.0, but the answer
in the comments of this bug is not adequate (changing the data field
of entities). Most Scilab users (the one who use it *daily* for
their work or their research) are used to make simple animations by
simply using the drawlater/drawnow pair. <br>
<br>
Scilab graphics was already fast in 5.3.3, and now even faster in
5.4 (the offscreen rendering is really cool). But if the performance
increase has this kind of counterpart, I will keep on using 5.3.3 :
my students really appreciate doing animations this way and I don't
have enough time to teach them the insights of graphical entities.<br>
<br>
S.<br>
<br>
<br>
Le 08/11/12 23:14, Eliseo Chacon Vera a écrit :
<blockquote cite="mid:03A71E27-EACF-4291-8B6B-0865120F8F93@um.es"
type="cite">
<pre style="font-family: Monospaced; font-style: normal; "><span style="color: rgb(1, 168, 1); font-style: italic; "><span class="Apple-style-span" style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">Dear Samuel,</span><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">
</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">thanks for your quick answer. The following lines solve the heat equation and provides </div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; "> a smooth evolution of the solution in the plot. SCILAB 5.3.3 likes but SCILAB 5.4.0 does not like it.</div></span><span style="color: rgb(1, 168, 1); font-style: italic; "><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">
</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">thanks,</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">
</div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; white-space: normal; ">eliseo (hope this time gets to the list right)</div></span></pre>
<pre style="font-family: Monospaced; font-style: normal; "><span class="Apple-style-span" style="font-size: 12px;"><span style="font-style: italic; ">///</span>
<span style="font-style: italic; ">// heat equation</span>
<span style="font-style: italic; ">//</span>
clear;
<span style="font-style: italic; ">//</span>
<span style="font-style: italic; ">// Initial value</span>
<span style="font-style: italic; ">//</span>
function z=<span style="text-decoration: underline; ">u0</span>(xx)
if (abs(xx)<=1) then
z=1;
else
z=0;
end
endfunction
<span style="font-style: italic; ">//</span>
<span style="font-style: italic; ">// b heat coef.</span>
<span style="font-style: italic; ">//</span>
b=1;
f0=<span style="text-decoration: underline; ">scf</span>(0);
f0.pixmap='on';
<span style="text-decoration: underline; ">clf</span>(f0);
show_window();
<span style="font-style: italic; ">//</span>
<span style="font-style: italic; ">// space interval</span>
<span style="font-style: italic; ">//</span>
xmin=-5;
xmax=5;
Nx=125; <span style="font-style: italic; ">// Number of points</span>
h=(xmax-xmin)/Nx;
x=xmin:h:xmax;
<span style="font-style: italic; ">//</span>
u=zeros(1,Nx+1);
uold=zeros(1,Nx+1);
u2=zeros(1,Nx+1); <span style="font-style: italic; ">// dimensionamos inicialmente a cero</span>
uold2=zeros(1,Nx+1);
ucero=zeros(1,Nx+1);
<span style="font-style: italic; ">//</span>
<span style="font-style: italic; ">// time</span>
<span style="font-style: italic; ">//</span>
t0=0;
time=t0;
for i=1:Nx+1
uold(i)=<span style="text-decoration: underline; ">u0</span>(x(i)); <span style="font-style: italic; ">// initial value</span>
uold2(i)=<span style="text-decoration: underline; ">u0</span>(x(i));
ucero(i)=<span style="text-decoration: underline; ">u0</span>(x(i));
end
<span style="text-decoration: underline; ">plot</span>(x,uold,'dr')
ejes=<span style="text-decoration: underline; ">gca</span>(); </span></pre>
<pre style="font-family: Monospaced; font-style: normal; "><span class="Apple-style-span" style="font-size: 12px;">ejes.data_bounds=[xmin, 0; xmax,1.2];</span></pre>
<pre style="font-family: Monospaced; "><span class="Apple-style-span" style="font-size: 12px;"><span style="font-style: normal; text-decoration: underline; ">title</span><span style="font-style: normal; ">(</span><span class="Apple-style-span" style="font-style: normal; ">" Initial data ");
</span><span style="font-style: normal; ">show_pixmap</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">sleep</span><span style="font-style: normal; ">(10</span><span style="font-style: normal; ">00</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">k</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">0.9</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">h</span><span style="font-style: normal; ">^</span><span style="font-style: normal; ">2</span><span style="font-style: normal; ">/</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">2</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">b</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;// stability</span>
<span style="font-style: italic; ">//</span>
<span style="font-style: italic; ">// coeficiente mu=k/h^2</span>
<span style="font-style: italic; ">//</span>
<span style="font-style: normal; ">mu</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">k</span><span style="font-style: normal; ">/</span><span style="font-style: normal; ">h</span><span style="font-style: normal; ">^</span><span style="font-style: normal; ">2</span><span style="font-style: normal; ">;</span>
<span style="font-style: italic; ">// </span>
<span style="font-style: normal; ">coef1</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">b</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">mu</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">coef2</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">-</span><span style="font-style: normal; ">2</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">b</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">mu</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">coef3</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">b</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">mu</span><span style="font-style: normal; ">;</span>
<span style="font-style: italic; ">//</span>
<span style="font-style: normal; ">while</span> <span style="font-style: normal; ">(</span><span style="font-style: normal; ">time</span><span style="font-style: normal; "><</span><span style="font-style: normal; ">0.5</span><span style="font-style: normal; ">)</span>
<span style="font-style: normal; ">time</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">time</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">k</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">u</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">0</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">u</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">Nx</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">0</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">for</span> <span style="font-style: normal; ">i</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">2</span><span style="font-style: normal; ">:</span><span style="font-style: normal; ">Nx</span>
<span style="font-style: normal; ">u</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">i</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">coef1</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">uold</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">i</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">coef2</span><span style="font-style: normal; ">*</span><span style="font-style: normal; ">uold</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">i</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">coef3</span><span style="font-sty
le: norma
l; ">*</span><span style="font-style: normal; ">uold</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">i</span><span style="font-style: normal; ">-</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">end</span>
<span style="font-style: normal; text-decoration: underline; ">clf</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">f0</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; text-decoration: underline; ">plot</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">x</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">u</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">or</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">x</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">ucero</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">db</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">ejes</span><span style="font-style: normal; ">=</span><span style="font-style: normal; text-decoration: underline; ">gca</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">ejes</span><span style="font-style: normal; ">.</span><span style="font-style: normal; ">data_bounds</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">[</span><span style="font-style: normal; ">xmin</span><span style="font-style: normal; ">,</span> <span style="font-style: normal; ">0</span><span style="font-style: normal; ">;</span> <span style="font-style: normal; ">xmax</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">1.2</span><span style="font-style: normal; ">]</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; text-decoration: underline; ">title</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">Euler explicit: time= </span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">string</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">time</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">..</span>
<span style="font-style: normal; ">+</span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">; time step = </span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">string</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">k</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">..</span>
<span style="font-style: normal; ">+</span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">; spatial h=</span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">string</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">h</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">; diffusion = </span><span style="font-style: normal; ">"</span><span style="font-style: normal; ">+</span><span style="font-style: normal; ">string</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">b</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; text-decoration: underline; ">legend</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">b=1</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">,</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">initial</span><span style="font-style: normal; ">'</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">show_pixmap</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">uold</span><span style="font-style: normal; ">=</span><span style="font-style: normal; ">u</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">sleep</span><span style="font-style: normal; ">(</span><span style="font-style: normal; ">1</span><span style="font-style: normal; ">)</span><span style="font-style: normal; ">;</span>
<span style="font-style: normal; ">end</span>
</span></pre>
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