[R] Premature termination of script

[Gabor Grothendieck]

On 7/30/05, Marco Blanchette <mblanche at uclink.berkeley.edu> wrote:
> I am fairly new to R and I am writing a script that would take a file, as an
> input, and generates a bunch of graphs out of it. My first task is to be
> sure that the file is of the right type by looking if there is a valid
> barcode in it as in (the barcode is beetween a double and single
> underscore):
> 
> library(tkWidgets)
> 
> ##############
> #Loading a file
> #testing if valid if not kill the execution
> ##############
> data.file <- fileBrowser(textToShow="Select a splice junction array
> extraction file")
> if ( t <- regexpr("__\\d*_",data.file, perl=T) == -1){
>    cat ("The selected file does not seem to be of the right type\n")
>    #Should be able to exit the script here
> }
> cat("File look good keep going\n")

How about just using an if statement:

if (...) { 
   cat("bad")
} else {
   cat("ok")
   # ... more processing
}

> 
> How do I prevent R from interpreting the rest of the script if the user
> don't input the right file?
> 
> 
> 
> 
> Marco Blanchette, Ph.D.
> 
> mblanche at uclink.berkeley.edu
> 
> Donald C. Rio's lab
> Department of Molecular and Cell Biology
> 16 Barker Hall
> University of California
> Berkeley, CA 94720-3204
> 
> Tel: (510) 642-1084
> Cell: (510) 847-0996
> Fax: (510) 642-6062
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>