How to insert a column into a matrix？
 

Hi,foamers,
I want to do some like this:
first,create a RectangularMatrix <scalar> A(n,m);
second, I calculate something and get a column B(n,1);
third,I want to insert the column B into the matrix A;
forth, loop the above 1-3 for several steps.
How can I do this?
Thanks for any ideas!:)