Future value expression in value function iteration

Hello! I have the following expression to analyze: futval = sum((ones(nkap,1)*prob(j,:)).*v,2)

The part (ones(nkap,1)*prob(j,:)) produces an nkap by N matrix.

After that, there is an element by element multiplication by v,2

The matrix v is nkap by N.

This whole expression produces an nkap by 1 matrix.

My question is, what is the point of including ",2" after "v"? Is this a way to choose a particular dimension within the matrix v?