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MathGroup Archive 2006

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How to use the max value from the solution of NDSolve ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72169] How to use the max value from the solution of NDSolve ?
  • From: Cham <martin465 at sympatico.ca>
  • Date: Wed, 13 Dec 2006 06:42:03 -0500 (EST)
  • Organization: The Math Forum

Suppose I'm solving a differential equation with NDSolve :

NDSolve[{ x'[t] == f[ x[t] ],  x[0] == 3.4 ], { x }, {t, 0, 10}]

Mathematica then finds a solution like this :

Out[]=  {{ x -> InterpolatingFunction[{{ 0.,  2.6532}}, <>}}

Next, I need to make several graphs of the solution.  How can I point to the max value t = 2.6532 without retyping that value each time, especially if I change the initial condition x[0] == 3.4 and redo NDSolve again ?  What is the name of the t_max found by Mathematica ?  Or how can I point to that special value ?  Is there a way ?


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