Partial integral of a 2d interpolation

Hi there,

I have an interpolated 2d function defined using griddedInterpolant and I need to integrate over one of its arguments. I can't seem to find how to do it. I get the error:

Error using scatteredInterpolant/subsref
The input data has inconsistent size.

I can't make the inputs discrete and use trapz, I need the continous integral.

[KSSV]

Show us the code, so that error can be rectified......without showing code how you expect us to debug?

[Walter Roberson]

Are you possibly calling upon integral() instead of integral2() ? integral() can lead to these kinds of problems more than integral2() does.

[cristina]

This is the code below. VT0 is an interpolation over a meshgrid. Te error seems to come from the fact that integral is doing numerical integration over a vector of nodes, but the second argument is a scalar. This breaks griddedInterpolant.

VT0 = griddedInterpolant(aa,ww,VT);

integral(@(w)VT0(50,w),0,100)
Error using griddedInterpolant/subsref
The input data has inconsistent size.

Error in @(w)VT0(50,w).*ppval(ft,w)

Error in integralCalc/iterateScalarValued (line 314)
                fx = FUN(t);

Error in integralCalc/vadapt (line 132)
            [q,errbnd] = iterateScalarValued(u,tinterval,pathlen);

Error in integralCalc (line 75)
        [q,errbnd] = vadapt(@AtoBInvTransform,interval);

Error in integral (line 88)
Q = integralCalc(fun,a,b,opstruct);

Is there a way for me to do this without digging in the code of Integral?

[cristina]

I have not used integral2 because I don't want to do a double integral. I want to fix one of the arguments and integrate over the other.

[cristina]

I got it. I have to give it the 'ArrayValued' option.

integral(@(w)VT0(50,w)0,100,'ArrayValued',1)

Thanks for the help anyways!