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MathGroup Archive 1994

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matrix of coefficients ANSWER

  • To: mathgroup at christensen.cybernetics.net
  • Subject: matrix of coefficients ANSWER
  • From: wmm at chem.wayne.edu (Martin McClain)
  • Date: Tue, 25 Oct 94 20:57:47 EDT

Many thanks to all the people who replied so rapidly to my question, which
was (nearly):
"If varsN is a list of N variables, and if exprsM is a list of of M
expressions, each one linear in the variables of varsN, what is the neatest
way to extract the matrix of coefficients?"
I doubt that anyone can surpass the answer by Richard Mercer:

Outer[Coefficient, exprsN, varsM]

Many thanks, Richard.  There were other good ones too, but this one
requires no foreknowledge of N or M, and uses no indices.  Great!







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