How do we select the column of a matrix?

Hello!

I am new to MKL and to C in general. Lets say that we have two matrices A, B of size (n,k). We would like for j =1 until k to subtrack the j column of A from B. In Matlab language the code is: for j=1:k, B(:,j)-A(:,j), end and in R language for(j=1 in k), { B[,j]-A[,j] }. I would like to ask if there is a routine to select the j column (or row) of a matrix? I searched but I had no luck.

Thank you very much.