Numerically integrating a symbolic expression

I am trying to integrate a matrix of symbolic entries in which all entries are function of x and y. This matrix is result of previous calculations and cannot be integrated symbolically. I want to numerically integrate it over a rectangluar region between points (-1,-1) , (1,-1), (1,1) and (-1,1). When I use integral2 function, the MATLAB gives following error message:

Error using integral2Calc>integral2t/tensor (line231) ...

A minimum working example is given below:

clear
close
clc

syms x y
f = sin(x) - cos(y)

%This will not work.
fun = @(x, y) f
q = integral(fun, -1, 1, -1, 1)

%This will work.
fun1 = @(x, y) sin(x) - cos(y)
q = integral(fun1, -1, 1, -1, 1)

Since the size of matrix is large (12 x 12) and it is inside a for loop, I cannot manually copy paste and run it.

Regards,

Ali Baig

Answer 1

[madhan ravi]

syms x y
f = matlabFunction(sin(x) - cos(y)); % read about matlabFunction()
q = integral2(f, -1, 1, -1, 1)
which integral2 -all %what shows up?

[Ali Baig]

Dear Madhan

Thank you.