Re: st: -args- how to flag when missing or too many arguments

[daniel klein <klein.daniel.81@gmail.com>]

John,

I think I would address this with something like this

cap pr drop john
pr john
	vers 12.1
	
	args a b c d
	if !inrange(`: word count `0'', 1, 4) {
		di as err "Please enter data after " ///
		"the command john as follows: vars df N chi"
		e 198
	}
	numlist "`0'" ,int r(>0)
	
end

Best
Daniel
--
Hi:

I am writing a program and would like Stata to return an error if an
argument is missing or there are too many of them.


For example, if an argument is not an integer, the below will return an error:


  program define john, rclass
  version 12
  args no_vars df N chi

  if `no_vars'<0 | `df'<0 | `N'<0 | `chi'<0 {
  di in red "You have to use integers."
  exit 498
  }
end

Now, how do I make Stata display:

di in red "Please enter data after the command john as follows: vars df N chi"


.....in cases where (a) there is a missing value (i.e., the user
missed putting 4 numbers) and (b) if the user provides too many
numbers (i.e., 5 instead of 4).
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