Index of a single match

Description

Return which(A %in% B) if it has length 1; give an error message otherwise.

Usage

whichAeqB(A, B, errNoMatch='no match',
                      err2Match='more than one match')

Arguments

Value

a single integer giving the index of the match in A.

Author(s)

Spencer Graves

See Also

interpPairs

Examples

a2b <- whichAeqB(letters, 'b')


all.equal(a2b, 2)

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> library(Ecfun)

Attaching package: 'Ecfun'

The following object is masked from 'package:base':

    sign

> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Ecfun/whichAeqB.Rd_%03d_medium.png", width=480, height=480)
> ### Name: whichAeqB
> ### Title: Index of a single match
> ### Aliases: whichAeqB
> ### Keywords: plot
> 
> ### ** Examples
> 
> a2b <- whichAeqB(letters, 'b')
> 
> ## Don't show: 
> stopifnot(
+ ## End(Don't show)
+ all.equal(a2b, 2)
+ ## Don't show: 
+ )
> ## End(Don't show)
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>