[R] For is.numeric condition in user input

[Ista Zahn]

readline always returns a character. See ?readline for details.

Best,
Ista

On Sun, Jul 24, 2011 at 10:59 PM, Bansal, Vikas <vikas.bansal at kcl.ac.uk> wrote:
> Dear all,
>
> I am using the following function so that user can input a numerical value.
>
> readnumber<- function()
>  {
> for(j in 1:10){
>  value=readline("enter the threshold for number of reads: ")
>  if(is.numeric(value)==T)
> {return(value)
> break}
> else
> print("wrong number Please enter numerical value ")}
>
>  }
>
> But if by chance user tries to put character it will show the message-
>  wrong number Please enter numerical value
>
> now when I am calling this function and entering numerical value,then also it is showing the message-wrong number Please enter numerical value
>
> Can you please tell me what mistake I am doing?
>
>
>
>
>
>
>
> Thanking you,
> Warm Regards
> Vikas Bansal
> Msc Bioinformatics
> Kings College London
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>



-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org