.\" -*- nroff -*- generated from .Rd format
.BG
.FN NLSstClosestX
.TL
Inverse Interpolation
.DN
Use inverse linear interpolation to approximate the `x' value at
which the function represented by `xy' is equal to `yval'.
.CS
NLSstClosestX(xy, yval)
.RA
.AG xy
a `sortedXyData' object
.AG yval
the numeric value on the `y' scale to get close to
.RT
A single numeric value on the `x' scale.
.EX
DNase.2 <- DNase[ DNase$Run == "2", ]
DN.srt <- sortedXyData( expression(log(conc)), expression(density), DNase.2 )
NLSstClosestX( DN.srt, 1.0 )
.KW data,manip
.WR
