| NLSstClosestX {stats} | R Documentation |
Use inverse linear interpolation to approximate the x value at
which the function represented by xy is equal to yval.
NLSstClosestX(xy, yval)
xy |
a sortedXyData object |
yval |
a numeric value on the y scale |
A single numeric value on the x scale.
Jose Pinheiro and Douglas Bates
sortedXyData, NLSstLfAsymptote,
NLSstRtAsymptote, selfStart
data( DNase ) DNase.2 <- DNase[ DNase$Run == "2", ] DN.srt <- sortedXyData( expression(log(conc)), expression(density), DNase.2 ) NLSstClosestX( DN.srt, 1.0 )