Numerical integration

2011 7 27
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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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Andrei Bobrov
Andrei Bobrov 2011-7-27

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y = 5; %eg: y-constant
quad(@(x)f(x,y),xmin,xmax)

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R yan
R yan 2011-7-27
My aim to get the value of the integral in terms of y. So that it can be again integrated with respect to y in the next step.
I have tried symbolic it works. But I need it numerical.
Andrei Bobrov
Andrei Bobrov 2011-7-27
doc dblquad
q = dblquad(f,xmin,xmax,ymin,ymax)
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

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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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R yan
R yan
2011-7-27

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