[R] wrong name of input file and goto like function

[Bert Gunter]

These are elementary programming constructs. I would suggest you take
a look at an online basic (as in elementary, not the Basic language)
programming tutorial to see how to do this sort of thing. R does it
like many other languages (with ?for, ?while, ?if, etc.).

-- Bert

On Sun, Jul 24, 2011 at 7:05 AM, Bansal, Vikas <vikas.bansal at kcl.ac.uk> wrote:
> Dear all,
>
> I have a question and need your help please.
> I have the following code which is asking user to enter the name of their file.
>
> define<- function()
>  {
>  readline("enter the name of your file: ")
>  }
>
> df=read.table(define(),fill=T,sep="\t",colClasses = "character")
>
> Now I want if user will input wrong name of file the code should not end and it should show a message-
>
> if()
> {
>  print("wrong name of the file Please enter again ")
>
>  }
>
> now I want to ask what should be the condition of if so that if user will input wrong file name it will show this message and then i want to use something like goto so that it should again start with the code which is before if condition-
>
> df=read.table(define(),fill=T,sep="\t",colClasses = "character")
>
>
>
>
> so the code should be-
>
> define<- function(x)
>  {
>  readline("enter the name of your file: ")
>  }
>
> df=read.table(define(),fill=T,sep="\t",colClasses = "character")           ##starline
>
>
> if(## some condition here)
> {
>  print("wrong name of the file Please enter again ")
> ## some goto function so that it should goto (starline)
>  }
>
>
>
>
>
>
>
> Thanking you,
> Warm Regards
> Vikas Bansal
> Msc Bioinformatics
> Kings College London
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
"Men by nature long to get on to the ultimate truths, and will often
be impatient with elementary studies or fight shy of them. If it were
possible to reach the ultimate truths without the elementary studies
usually prefixed to them, these would not be preparatory studies but
superfluous diversions."

-- Maimonides (1135-1204)

Bert Gunter
Genentech Nonclinical Biostatistics