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MathGroup Archive 1994

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Re: matrix of coefficents

  • To: mathgroup at
  • Subject: Re: matrix of coefficents
  • From: merx at (Hendrik Merx)
  • Date: Tue, 25 Oct 94 13:55:35 +0100

Dear MathGroup !

wmm at (Martin McClain) wrote:

> If 
> varsN = a list of N variables, 
> and if
> exprsN = a list of of N expressions, each one linear in the variables of
> varsN,
> Is there some operator (that I haven't found yet), or some clever way to
> use a nonobvious operator, to get the matrix of coefficients? 

You should try the Jacobian matrix which is the matrix of derivatives of
all expressions to all variables. It's in the Mathematica book in the
Tour through Mathematica, section 9. Programming ( p. 12 in the german

Jacobi[funs_List, vars_List] := Outer[D, funs, vars]

Hope this helps


merx at

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