Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Change of Basis function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68949] Change of Basis function
  • From: David Boily <dsboily at fastmail.ca>
  • Date: Fri, 25 Aug 2006 05:34:59 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I would like to know if there is a function capable of giving as output
the representation of a vector in a given basis. For example:

FunctionX[{1,2,3}, {{1,2,0},{0,1,0},{0,0,1}}]

(where the first argument is the vector and the second the basis)

would yield

{1,0,3}

and

FunctionX[f x1 - b x2 + x3 - x2, {x1,x2,x3}]

would yield 

{f, -b-1, 1}

I'm more interested in the second case, obviously, because the first one
can be achieved with a simple matrix multiplication.

David Boily
Center for Intelligent Machines 
Mcgill University


  • Prev by Date: Symmetric polynomials
  • Next by Date: path along equi-contours
  • Previous by thread: Re: Symmetric polynomials
  • Next by thread: Re: Change of Basis function