Hi, As KSSV wrote, you need to elaborate your question a bit. But if I am guessing right, you have a matrix A, represented in some coordinate system, and you want to transform it to a different coordinate system. You also have the transformation matrix T. If so, the way to transform is:
B = T*A*T'
Where T' is the transpose of T (actually it is the inverse matrix but with linear transformation it is the same) and B contains the transformed values of A. This is the case ONLY if I understood right your problem!