Symbolic Manipulation of Matrices [Newbie Question]

*To*: mathgroup at smc.vnet.net*Subject*: [mg113210] Symbolic Manipulation of Matrices [Newbie Question]*From*: stefan <stefan.duke at gmail.com>*Date*: Tue, 19 Oct 2010 05:54:04 -0400 (EDT)

Hello, I am a complete newbie in Mathematica and wante to solve the following: I have the matrix Y and the vector P0. The vector P1 = Y.PO Now I transform P1 to Star. This expresses Star in term of Y.PO. I would like to know now how can I simplify this expression so it yields Star = Ytransformed * P0. I can do that by hand, but I wonder how do such things in Mathematica Thanks for any pointers! Best, Stefan Y = {{Subscript[y, 11], Subscript[y, 12]}, {Subscript[y, 21], Subscript[y, 22]}} P0 = {Subscript[p0, 1], Subscript[p0, 2]} P1 = Y.P0 Star = {P1[[1]] + (1 - a)*P1[[2]], a*P1[[2]]}