Can Character Vector Be Coerced To Numeric?

Determines whether each element of a character vector can be coerced to numeric.

isNumeral(c)

is.numeral(c)

Arguments

c	A vector of strings.

Value

A vector of logicals, NA where is.na(c).

Details

Checks element-wise as to whether each item in a vector of strings can be coerced to numeric.

Basics cribbed from http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#R.

is.numeral() is deprecated.

Author

David Braze davebraze@gmail.com

Examples

x <- c('a', 'IX', 'twelve', '0001', '2', '3e1', '-4', '5.5', 'Inf', NA)
data.frame(x,
           isNumeral(x),
           as.numeric(x))
#> Warning: NAs introduced by coercion
#>         x isNumeral.x. as.numeric.x.
#> 1       a        FALSE            NA
#> 2      IX        FALSE            NA
#> 3  twelve        FALSE            NA
#> 4    0001         TRUE           1.0
#> 5       2         TRUE           2.0
#> 6     3e1         TRUE          30.0
#> 7      -4         TRUE          -4.0
#> 8     5.5         TRUE           5.5
#> 9     Inf         TRUE           Inf
#> 10   <NA>           NA            NA