Inverse of Interpolating Function?

*To*: mathgroup at smc.vnet.net*Subject*: [mg120362] Inverse of Interpolating Function?*From*: gonzorascal <djw22 at duke.edu>*Date*: Wed, 20 Jul 2011 06:31:51 -0400 (EDT)

Hello All, I am working with an Interpolating Function of an oscillating solution (time series) to a differential equation. I am trying to find the period and pulse width of the oscillation. To do this I would like to have an inverse of my function y[t] (so I would have t[y]). I realize this function would be multivalued (that's what I want to find the period). I am not having success using Mathematica's InverseFunction[] or Reduce[] commands. Does anyone have any experience or suggestions with this sort of thing (either finding Inverse Interpolating Functions or another method for period and pulse width)? Thank you. -GR

**Follow-Ups**:**Re: Inverse of Interpolating Function?***From:*Daniel Lichtblau <danl@wolfram.com>