[R] list(0) to integer

[Tobias Verbeke]

On Mon, 27 Dec 2004 03:18:53 -0800 (PST)
Frederic renaud <fren2 at yahoo.com> wrote:

> Hello
> I've another question :-)
> I would like to transform a list to a integer.
> I must be sure that the number entered by the user is
> an integer! Thus, I've made :
> 
> 
> repeat{
>   cat("Effectif des populations (integer):")
>   n<-scan("",n=1,what=list(0),quiet=TRUE)
> 
>   if (is.integer(n[[1]])==TRUE) break
>   print("L'effectif des population doit etre un
> entier")
>   }

if (!is.integer(unlist(n))) stop("L'effectif ...")

You don't need `== TRUE' (and I guess you meant `== FALSE')
An error action can be executed using stop("some error message").
`break' breaks out of the loop (ie goes to the first statement
after the loop), so the print statement cannot be executed.

Are you sure you need n to be a list ?

HTH,
Tobias

>  That doesn't work of course but I've no idea to do
> this. How verify that n[[1]] is an integer an
> transform them as an integer (as.integer(n) doesn't
> work!) 

> Someone can help me? Thanks!
> Fred
> 
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