NLSstClosestX Inverse Interpolation

Description

Use inverse linear interpolation to approximate the x value at which the function represented by xy is equal to yval.

Usage

NLSstClosestX(xy, yval)

Arguments

xy	a sortedXyData object
yval	a numeric value on the y scale

Value

A single numeric value on the x scale.

Author(s)

José Pinheiro and Douglas Bates

See Also

sortedXyData, NLSstLfAsymptote, NLSstRtAsymptote, selfStart

Examples

DNase.2 <- DNase[ DNase$Run == "2", ]
DN.srt <- sortedXyData(expression(log(conc)), expression(density), DNase.2)
NLSstClosestX(DN.srt, 1.0)