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expression form

  • To: mathgroup at
  • Subject: [mg100997] expression form
  • From: Haibo Min <yshdfeng at>
  • 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
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

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