I want to get the result of a multiplication between a matrix and a vector, basically I want to do a change of reference frame of a vector, so I cannot perform this operation in mathematica.
A = {{2, 4}, {2, 1}} // MatrixForm
C2 = {{6}, {5}} // MatrixForm
A.C2 (*This does not work*)
I want to get something like this:
{{2, 4}, {2, 1}}.{{6}, {5}} // MatrixForm
Actually I have something more complex, but this is enough to show my problem.
Do you have any suggestion?