Hmisc: approxExtrap – R documentation

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approxExtrap

Linear Extrapolation

Description

Works in conjunction with the approx function to do linear extrapolation. approx in R does not support extrapolation at all, and it is buggy in S-Plus 6.

Usage

approxExtrap(x, y, xout, method = "linear", n = 50, rule = 2, f = 0,
             ties = "ordered", na.rm = FALSE)

Arguments

`x,y,xout,method,n,rule,f`	see `approx`
`ties`	applies only to R. See `approx`
`na.rm`	set to `TRUE` to remove `NA`s in `x` and `y` before proceeding

Details

Duplicates in x (and corresponding y elements) are removed before using approx.

Value

a vector the same length as xout

Author(s)

Frank Harrell

Examples

approxExtrap(1:3,1:3,xout=c(0,4))

Hmisc

Harrell Miscellaneous

v4.5-0

GPL (>= 2)

Authors

Frank E Harrell Jr <fh@fharrell.com>, with contributions from Charles Dupont and many others.

Initial release

2021-02-27