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Re: Problems to find the local extrema of an InterpolatingFunction

• To: mathgroup at smc.vnet.net
• Subject: [mg87929] Re: Problems to find the local extrema of an InterpolatingFunction
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sat, 19 Apr 2008 23:54:52 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <fuc7qh$a0q$1@smc.vnet.net>

Modeler wrote:

> does anyone know how to find all the local extrema of an InterpolatingFunction in a specified interval? The only
> thing that seems to work is Findroot, but it only finds a single root each time. Other rootfinding commands do not seem to work. Thanks for your help.

The following might help (Note that NDSolve[] returns an 
InterplolatingFunction so most of the post is relevant)

"Minima"
http://groups.google.com/group/comp.soft-sys.math.mathematica/msg/af7fdc8beb46b09a

Regards,
-- Jean-Marc