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MathGroup Archive 1996

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differential equation

  • To: mathgroup at
  • Subject: [mg4766] differential equation
  • From: Ralph Gensheimer <ralphg at>
  • Date: Fri, 13 Sep 1996 13:54:50 -0400
  • Sender: owner-wri-mathgroup at

dear group,

i have the folowing problem:

in an ordinary differential equation system,
(solution functions are  y1(r), y2(r), y3(r) ) is an integration in another variable x.
and in this integral there is also the solution function y3(r).
r and x are independent.
the problem has the following structure:

NDSolve[{y1'[r] == y2[r],
         y2'[r] == -(2/r)*y2[r]+
         y1[r]*y3'[r] == y2[r],
                                 y3[0.001]==0 },{y1,y2,y3},{r,0.001,0.2}]

can you give me ideas to solve this problem ?



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