Double integral on matlabFunction

I am trying to integrate a function(Ke) with arguments (x,y). The code is given below:

clear all;
syms x y a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 de1 de2 de3 de4 de5 de6 de7 de8 de9 de10 de11 de12
w = @(x,y)a0 +a1*x + a2*y + a3*x^2 + a4*x*y + a5*y^2 + a6*x^3 + a7*(x^2)*y + a8*x*y^2 +a9*y^3 + a10*(x^3)*y + a11*x*(y^3);
a=[a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11].';
A =[1 0 0 0 0 0 0 0 0 0 0 0;0 1 0 0 0 0 0 0 0 0 0 0;0 0 1 0 0 0 0 0 0 0 0 0;
    1 0.5 0 0.25 0 0 0.125 0 0 0 0 0;0 1 0 1 0 0 0.75 0 0 0 0 0;0 0 1 0 0.5 0 0 0.25 0 0 0.125 0;
    1 0.5 0.5 0.25 0.25 0.25 0.125 0.125 0.125 0.125 0.0625 0.0625;
    0 1 0 1 0.5 0 0.75 0.5 0.25 0 0.375 0.125;
    0 0 1 0 0.5 1 0 0.25 0.5 0.75 0.125 0.375;
    1 0 0.5 0 0 0.25 0 0 0 0.125 0 0;
    0 1 0 0 0.5 0 0 0 0.25 0 0 0.125;
    0 0 1 0 0 1 0 0 0 0.75 0 0];
de = [de1 de2 de3 de4 de5 de6 de7 de8 de9 de10 de11 de12].';

H = ([1 x y x^2 x*y y^2 x^3 (x^2)*y x*(y^2) y^3 (x^3)*y x*(y^3)]*inv(A)).';

B = [diff(H(1),x,2) diff(H(2),x,2) diff(H(3),x,2) diff(H(4),x,2) diff(H(5),x,2) diff(H(6),x,2) diff(H(7),x,2) diff(H(8),x,2) diff(H(9),x,2) diff(H(10),x,2) diff(H(11),x,2) diff(H(12),x,2);
    diff(H(1),y,2) diff(H(2),y,2) diff(H(3),y,2) diff(H(4),y,2) diff(H(5),y,2) diff(H(6),y,2) diff(H(7),y,2) diff(H(8),y,2) diff(H(9),y,2) diff(H(10),y,2) diff(H(11),y,2) diff(H(12),y,2);
    diff(diff(H(1),x),y) diff(diff(H(2),x),y) diff(diff(H(3),x),y) diff(diff(H(4),x),y) diff(diff(H(5),x),y) diff(diff(H(6),x),y) diff(diff(H(7),x),y) diff(diff(H(8),x),y) diff(diff(H(9),x),y) diff(diff(H(10),x),y) diff(diff(H(11),x),y) diff(diff(H(12),x),y)];

E = 210e9;
h = 0.001;
nu = 0.3;
d = (E*h^3)/12*(1-nu^2);
D = [d nu*d 0; nu*d d 0; 0 0 0.5*(1-nu)*d];

Ke = matlabFunction(B.'*D*B,'Vars',[x y]);
K_e = integral2(Ke,0,0.5,0,0.5)

The error message is:

Error using reshape
Number of elements must not change. Use [] as
one of the size inputs to automatically
calculate the appropriate size for that
dimension.

Error in
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Error in integral2Calc>integral2t/tensor (line
228)
        Z = FUN(X,Y);  NFE = NFE + 1;

Error in integral2Calc>integral2t (line 55)
[Qsub,esub] = tensor(thetaL,thetaR,phiB,phiT);

Error in integral2Calc (line 9)
    [q,errbnd] =
    integral2t(fun,xmin,xmax,ymin,ymax,optionstruct);

Error in integral2 (line 106)
    Q =
    integral2Calc(fun,xmin,xmax,yminfun,ymaxfun,opstruct);

Error in ASS1 (line 28)
K_e = integral2(Ke,0,0.5,0,0.5)
 

Need a solution for this error. Thanks

[Ameer Hamza]

Your function K_e returns a matrix for scalar inputs. Try

K_e(1, 1)

How do you want to integrate this matrix?

[Walter Roberson]

integral2 cannot be used with matrix integration.

[vinayak vijay]

I need to evaluate the above statement where the integral is a double integral over x and y. The limits for x an y are (0,0.5). Could you advise a way to do this?