Symbolic 4D array

I have a symbolic 4D array V(i,j,k,l). I want to sum over the l component to reduce it to 3D. I tried x(i,j,k)=sum(V(i,j,k,:)) but it is not working. Any advice

Answer 1

[James Tursa]

Not sure why sum(V,4) doesn't work, but reducing it to 2D with some reshapes seems to work:

z = size(V);
x = reshape(sum(reshape(V,[],z(end)),2),z(1:end-1));

[ahmed sengab]

thanks

[Sulaymon Eshkabilov]

sum(V, 4) works ok! but reshape() thing gives a size related error.