I have a program that does some data analysis and is a few hundred lines long Very early on in the program I want to do some quality control and if there is not enough data I want the program to terminate and return to the R console Otherwise I want the rest of the code to execute I ve tried break browser and quit and none of them stop the execution of the rest of the program and quit stops the execution as well as completely quitting R which is not something I want to happen My last resort is creating an if-else statement as below if n lt 500 else insert rest of program here but that seems like bad coding practice Am I missing something

You could use the stopifnot function if you want the program to produce an error foo lt - function x stopifnot x gt 500 rest of program

break/exit script - SyntaxFix

You could use the stopifnot() function if you want the program to produce an error:

foo <- function(x) {
    stopifnot(x > 500)
    # rest of program
}

~ Answered on 2013-07-24 14:56:30