is.number {lazy.tools}

R Documentation

Check if a string vector contains numbers only.

Description

Check if a string vector contains numbers only.

Usage

is.number(arg, pat = 1)

Arguments

arg	a vector or a list
pat	= 1 to match non-negative integers = 2 to match signed real numbers = 3 to match integers

Details

The leading and trailing blank characters will be ignored.

Value

If arg is a vector or matrix, a scalar TRUE or FALSE.
If arg is a list, a vector of the same length as the arg consisting of TRUEs or FALSEs.

Examples

vec=c("a","1","1.4","b.","-b","-2","2-"," 12 ","5 5","0.4",".4","-0.","-0.8")
is.number(vec)
printm(vec,is.number(as.list(vec)),is.number(as.list(vec), 2))
is.number( list( c("1","2","a"), c(1,2) ) )
is.number( list( 2, -2,"-2","-2." ), 3 )

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