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expression form

• To: mathgroup at smc.vnet.net
• Subject: [mg100997] expression form
• From: Haibo Min <yshdfeng at gmail.com>
• Date: Fri, 19 Jun 2009 20:48:29 -0400 (EDT)

Hi, I am fairly new to mathematica, and I have a question on the matrix
multiplication operator.

Suppose a={a1,a2,a3},P={{p11,p12,p13},{p21,p22,p23},{p31,p32,p33}}. I want
to get the explicit expression of a'Pa, where a' is the transpose of vector
a. Since there is no "transpose" concept for vector, my expression in
mathematica is
a.P.a
However, it just
returns  {a1,a2,a3}.{{p11,p12,p13},{p21,p22,p23},{p31,p32,p33}}.{a1,a2,a3},
seems nothing is done about this, why?
I use mathematica v7.0

Thank you!

Haibo Min
yshdfeng at gmail.com

• Follow-Ups:
  • Re: expression form
    • From: Haibo Min <yshdfeng@gmail.com>
  • Re: expression form
    • From: "Matthias Bode" <lvsaba@hotmail.com>
  • Re: expression form
    • From: "Scot T. Martin" <smartin@seas.harvard.edu>