[R] Determine the data type of a function to an argument

[Francisco J. Zagmutt]

Look at ?class and perhaps is?.  i.e.

x=c("1","2","3")
class(x)
[1] "character"

x=c(1,2,3)
class(x)
[1] "numeric"

I hope this helps

Francisco

Dr. Francisco J. Zagmutt
College of Veterinary Medicine and Biomedical Sciences
Colorado State University




>From: "Alex Restrepo" <alex_restrepo at hotmail.com>
>To: r-help at stat.math.ethz.ch
>Subject: [R] Determine the data type of a function to an argument
>Date: Tue, 20 Jun 2006 15:48:03 -0500
>
>Hello All:
>
>How can I determing the "types" of args passed to an R function?  For
>example, given the following:
>
>
>     calculate <- function(...)
>     {
>         args <- list(...)
>         argName     = names(args)
>
>         if (arg1 == character)
>             cat("arg1 is a character")
>         else
>              cat("arg1 is numeric")
>
>
>         if (arg2 == character)
>             cat("arg2 is a character")
>         else
>             cat("arg2 is a numeric")
>
>     }
>     value = calculate(arg1='222' arg2=333)
>
>Programatically, how can I determine if arg1 is a character and arg2 is
>numeric?
>
>Many Thanks:
>
>Alex
>
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