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From: "Jan Simon" <matlab.THIS_YEAR@nMINUSsimon.de>
Newsgroups: comp.soft-sys.matlab
Subject: Re: ? find xi of given yi from a given table
Date: Fri, 14 May 2010 14:03:06 +0000 (UTC)
Organization: Universit&#228;t Heidelberg
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Dear Cheng!

>  Suppose y is a function of x, and we have a set of data points from
> experiment.
> 
> How do we determine the value of x_target corresponding to a target
> value of y_target? If we know the function form of y = f(x), and then
> we can use root-finding algorithms such as Newton method. But now we
> only have discrete data points.

Are you looking for INTERP1 ?

Jan