st: generate an error message if the wrong number of args is given following the args command

[Nathan Danneman <ndanneman@gmail.com>]

Hi all,

I have written a program, which utilizes the args command.  The
program analyzes regression results, and requires the user to input a
single constant.  Is there a way to generate an error message if the
user inputs an incorrect number of arguments (either none, or more
than one)?

Here is what the program looks like...

capture program drop example
program example
	version 10.1
	args factor
** I would like to input a line here that would do something like (if
number of args != 1, then error "wrong number of arguments")
...
...

end

Thanks,
ND

-- 
"Imagination is more important than knowledge..."
      -- Albert Einstein
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