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Use inverse linear interpolation to approximate the x value at which the function represented by xy is equal to yval.
x
xy
yval
NLSstClosestX(xy, yval)
a sortedXyData object
sortedXyData
a numeric value on the y scale
y
A single numeric value on the x scale.
sortedXyData, NLSstLfAsymptote, NLSstRtAsymptote, selfStart
NLSstLfAsymptote
NLSstRtAsymptote
selfStart
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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