Format numbers as CAS numbers

This function attempts to format numeric (or character) vectors as character vectors of CAS numbers. If they cannot be converted to CAS format or don't pass is.cas, NA is returned

Usage

as.cas(x, verbose = getOption("verbose"))

Arguments

x

numeric vector, or character vector of CAS numbers missing the hyphens

verbose

logical; should a verbose output be printed on the console?

Value

character vector of valid CAS numbers

See also

is.cas

Examples

x = c(58082, 123456, "hexenol")
as.cas(x)
#>     58082    123456   hexenol 
#> "58-08-2"        NA        NA