Find the x with the closest y

Usage

NLSstClosestX(xy, yval)

Arguments

xy a sortedXyData object
yval the numeric value on the y scale to get close to

Description

This function is used to determine the x value in a sortedXyData object that corresponds to the y value that is closest to yval. The function is mostly used within the initial functions for a self-starting nonlinear regression models, which are in the selfStart class.

Value

A single numeric value which is one of the values of x in the xy object.

Author(s)

Jose Pinheiro and Douglas Bates

Examples

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


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