| % File src/library/stats/man/NLSstClosestX.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2010 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{NLSstClosestX} |
| \encoding{UTF-8} |
| \title{Inverse Interpolation} |
| \alias{NLSstClosestX} |
| \alias{NLSstClosestX.sortedXyData} |
| \usage{ |
| NLSstClosestX(xy, yval) |
| } |
| \arguments{ |
| \item{xy}{a \code{sortedXyData} object} |
| \item{yval}{a numeric value on the \code{y} scale} |
| } |
| \description{ |
| Use inverse linear interpolation to approximate the \code{x} value at |
| which the function represented by \code{xy} is equal to \code{yval}. |
| } |
| \value{ |
| A single numeric value on the \code{x} scale. |
| } |
| \author{\enc{José}{Jose} Pinheiro and Douglas Bates} |
| \seealso{\code{\link{sortedXyData}}, \code{\link{NLSstLfAsymptote}}, |
| \code{\link{NLSstRtAsymptote}}, \code{\link{selfStart}}} |
| \examples{ |
| DNase.2 <- DNase[ DNase$Run == "2", ] |
| DN.srt <- sortedXyData(expression(log(conc)), expression(density), DNase.2) |
| NLSstClosestX(DN.srt, 1.0) |
| } |
| \keyword{manip} |