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MathGroup Archive 2002

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The equivalent of FindRoot for an interpolating function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg37470] The equivalent of FindRoot for an interpolating function
  • From: "Philip M. Howe" <pmhowe at lanl.gov>
  • Date: Thu, 31 Oct 2002 04:42:16 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Folks,

I wish to find the value of the independent variable in an 
interpolating function that makes the dependent variable assume some 
value of interest.  For example,

sol = NDSolve[{y'[t] == 1-y[t], y[0]==0}, y, {t, 0, 20}] 
fy = y/.sol[[1]]

produces an interpolating function.  I would like to extract the 
value of t that yields a value of 0.99 or 0.9999 (say) for y.  Is 
there a straightforward way of doing this?

Thanks in advance for the help.

Regards,

Phil
-- 
Philip M. Howe
Program Manager, Stockpile Surety
Los Alamos National Laboratory

(505) 665-5332
(505) 667-9498
Fax: 505-665-5249
email pmhowe at lanl.gov
Mail Stop P945


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