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How do I throw an error and exit inside Mata

I'm writing a function in Stata where I do some logical checks and possibly throw an error. Could look something like this:

if ! r(N) {
    disp as error "There are no observations with a value of 1 in the subgroup."
    exit
}

Now, I'm also running some Mata code and I would like to do logical checks in Mata as well and possibly throw an error like the one above. How would I do that?

Solution

  • Read up on the exit() and error() functions of Mata.

    help mf_exit 

help mf_error