break/exit script

Question

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 < 500){} else{*insert rest of program here*} ``` but that seems like bad coding practice. Am I missing something?

Accepted Answer

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

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

break/exit script

Solution

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