...maybe simp : false will work for you:
(%i41) simp : false$
(%i42) matrix([t^3,t^2,t,1]).matrix([a],[b],[c],[d]);
(%o42) matrix([t^3,t^2,t,1]).matrix([a],[b],[c],[d])
Barton
-----maxima-bounces at math.utexas.edu wrote: -----
>To: maxima at math.utexas.edu
>From: Mike Higgins <mike at kayaker.net>
>Sent by: maxima-bounces at math.utexas.edu
>Date: 07/23/2007 12:10PM
>Subject: Disable simplification on input
>
>How do I disable the automatic simplification on input?