Equivalent of “throw” in R

Question

How does one \"throw\" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don\'t exist, I want the fun

Answer 1

See help(tryCatch):

Conditions are signaled by 'signalCondition'. In addition, the
'stop' and 'warning' functions have been modified to also accept
condition arguments.

and later under 'See Also':

'stop' and 'warning' signal conditions, and 'try' is essentially a simplified version of 'tryCatch'.

so you probably want stop.