Maxima Newbie Question: Matrix*Vector multiplication ?

The VECT package is designed for working with vector dot and cross
products, and so redefines "." as the vector dot-product.  I can't say I
particularly like this way of doing things, but the documentation does
warn explicitly: ''Warning:  The VECT package declares "." to be a
commutative operator.''

If you need both the vector simplifications defined by VECT and normal
matrix functionality, I think you are out of luck.  You can try
remove(".",commutative), but that will eviscerate vector dot-product
simplification.  What exactly did you want from the VECT package?
Perhaps you only loaded it because you thought it was necessary for
matrix-vector operations?

I suspect that the solution is simply not to load VECT at all.

      -s