Numerical integration

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??

Answer 1

[Andrei Bobrov]

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

[R yan]

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]

doc dblquad

q = dblquad(f,xmin,xmax,ymin,ymax)

[R yan]

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]

Not for *all* f(x,y), but almost certainly for *your* f(x,y). See Fubini's theorem, for example.

Answer 2

[Innocent]

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