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Le 26/04/2012 14:02, Adrien Vogt-Schilb a écrit :
<blockquote cite="mid:4F993946.4050108@centre-cired.fr" type="cite">
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Hi<br>
<br>
Scilab has a proceudre that integrates any given real function or
external:<br>
<br>
<div class="refsynopsisdiv">
<h3 class="title"> </h3>
<div class="synopsis">
<pre><span class="default">[v]=</span><span class="functionid">intg</span><span class="default">(a,b,f)</span></pre>
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<br>
I have a function f and would like to calculate the integral for a
set of values , say in A:B<br>
<br>
Does anyone know if there is something more efficient than a loop
on b to do? Currently I do this:<br>
<br>
segment = A:B;<br>
<br>
for i=1:size(segment,"*") <span class="default"><br>
[v(i)]=</span><span class="functionid">intg</span><span
class="default">(A,segment(i),f)</span>
<div class="synopsis"> </div>
end<br>
<br>
It's a shame, because I guess that that there should be a way to
optimize what intg does in this case<br>
<br>
<br>
<div class="moz-signature">-- <br>
Adrien Vogt-Schilb (Cired) <br>
Tel: (+33) 1 43 94 <b>73 77</b></div>
</blockquote>
The following code should be more efficient<br>
for i=2:size(segment,"*") <span class="default"><br>
v(i)=</span><span class="functionid">intg</span><span
class="default">(segment(i-1),segment(i),f)</span>
<div class="synopsis"> </div>
end<br>
v=cumsum(v)<br>
<br>
Serge Steer<br>
<br>
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