Why do i get error "array have incompatible sizes for this operation error"

Dear all

I have problem with integral. I did not figure out what is wrong.

Please let me know the mistake.

Vb1=0.228;

Rx1=4E-9;
Ry1=4E-9;
Rx2=4E-9;
Ry2=4E-9;

x1=-6E-9;
y1=-6E-9;
x2=6E-9;
y2=6E-9;

w=1E+12; T=2*pi/w;
alfa=1E-9;
for i=1:numel(x)
    for    j =1:numel(y)
                fx = @(t) x(i) + alfa*sin(w.*t);
                idx1 =@(t) ((fx(t)-x1)/Rx1).^2 + ((y(j)-y1)/Ry1).^2 < 1;
                idx2 =@(t) ((fx(t)-x2)/Rx2).^2 + ((y(j)-y2)/Ry2).^2 < 1;

                Vb =@(t) (X<0).*(1-idx1(t))*Vb1 + (X>0).*(1-idx2(t))*Vb1;
                V0(i,j) = (1/T).*integral(Vb,0,T);
    end
end

Unrecognized function or variable 'x'.

[Torsten]

Please include x and y.

What is big X ?

[Özgür Alaydin]

I saw the mistake, thanks for help.

[X,Y]=meshgrid(x,y);

I wrote big X time dependente and problem solved.

[Torsten]

For clarity, better use

idx1 =@(t) (((fx(t)-x1)/Rx1).^2 + ((y(j)-y1)/Ry1).^2) < 1;
idx2 =@(t) (((fx(t)-x2)/Rx2).^2 + ((y(j)-y2)/Ry2).^2) < 1;

instead of

idx1 =@(t) ((fx(t)-x1)/Rx1).^2 + ((y(j)-y1)/Ry1).^2 < 1;
idx2 =@(t) ((fx(t)-x2)/Rx2).^2 + ((y(j)-y2)/Ry2).^2 < 1;