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
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