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list(0) to integer

2 messages · Frederic renaud, Tobias Verbeke

Original
Frederic renaud
# 
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")
  }

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

            

      
      
      
    

        
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