Numerical integration

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R yan
R yan 2011-7-27
I want to integrate numerically f(x,y) with respect to x keeping y constant. Can quad do it with some modifications?
Any other ideas??

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2011-7-27
y = 5; %eg: y-constant
quad(@(x)f(x,y),xmin,xmax)
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R yan
R yan 2011-7-28
you mean to say:
int(int(f(x,y),x,a,b),y,a,b)=dblquad('f(x,y)',a,b,a,b)
valid for all f(x,y)?
Mike Hosea
Mike Hosea 2011-8-2
Not for *all* f(x,y), but almost certainly for *your* f(x,y). See Fubini's theorem, for example.

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Innocent
Innocent 2011-8-2
Hi Yan, i did post an example of simple code under newsgroup follow the link bellow to check it out.
http://www.mathworks.com/matlabcentral/newsreader/view_thread/311099#847432

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