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MathGroup Archive 2000

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Using results of "Solve"

  • To: mathgroup at
  • Subject: [mg25693] Using results of "Solve"
  • From: Helge Kreutzmann <helgek at>
  • Date: Thu, 19 Oct 2000 04:35:20 -0400 (EDT)
  • Organization: Universitaet Hannover
  • Sender: owner-wri-mathgroup at

Hello !
I have a series of matrices which depend on several parameters. I can
create those matrices fine and display them. They are called


Now there is an unkown called "q" in the matrix which is evaluated by
setting the determinant of the matrix zero and solving the resulting
equation for q:

Solve[Det[S[2, m, b, 2]] == 0, q]

Now I want to use this function. The result is given in a form like:
{{ q -> rhs1 },{ q -> rhs2}} and so on. I would like now to plot q.

A colleque gave me the following "hack":
h =.;
h[m_, b_] := Solve[Det[S[2, m, b, 2]] == 0, q];
Plot3D[q  /. h[m, b] [[2]], {m, 0, 3}, {b, 0, 3}]

Is there a more straightforward way ? Especially I would like to create
several functions this way and their sum is the resulting function I
am interested in (actually it's a series).



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