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


From   John Antonakis <[email protected]>
To   [email protected]
Subject   Re: st: -args- how to flag when missing or too many arguments
Date   Fri, 22 Mar 2013 08:51:06 +0100

Thanks Nick.  That works.

With respect to flagging less than four Austin gave me some nice code that works. Following Nick's approach, the below doesn't work and I can't see why:

  ...
  args no_vars df N chi too_much

*nick's part, works
  if "`too_much'" != "" {
  di as err "Too many arguments. "
  exit 198
  }

*my part, does not work
  if "`no_vars'"=="" | "`df'"=="" | "`N'"=="" | "`chi'"=="" {
  di as err "You have to use four integers. "
  exit 498
  }

Best,
J.

__________________________________________

John Antonakis
Professor of Organizational Behavior
Director, Ph.D. Program in Management

Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland
Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305
http://www.hec.unil.ch/people/jantonakis

Associate Editor
The Leadership Quarterly
__________________________________________

On 22.03.2013 02:46, Nick Cox wrote:
My approach for these problems is -- in a case with only 4 arguments wanted --

args a b c d garbage

if "`garbage'" != ""
        di as err "too many arguments"
        exit 198
{

On Thu, Mar 21, 2013 at 10:14 PM, John Antonakis <[email protected]> wrote:
Thanks, Austin.

This works too, except for when w > 4; it does not display the error.  The
program just ignores any arguments beyond 4 arguments (as is the default in
Stata).


Best,
J.

__________________________________________

John Antonakis
Professor of Organizational Behavior
Director, Ph.D. Program in Management

Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland
Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305
http://www.hec.unil.ch/people/jantonakis

Associate Editor
The Leadership Quarterly
__________________________________________

On 21.03.2013 22:54, Austin Nichols wrote:
John Antonakis <[email protected]>:
You might also want to step through various conditions and then issue
a more informative error message at the end, e.g. consider adapting
this approach:

cap prog drop john
prog john, rclass
   version 12
   loc err 0
   args no_vars df N chi
   loc w: word count `no_vars' `df' `N' `chi'
   if `w'>4 {
    loc err 1
    di in red "More than 4 arguments given"
    }
   foreach v in no_vars df N chi {
    cap confirm integer number `=``v'''
    if _rc!=0 {
     loc err 1
     di in red "Arguments must be integers."
     }
    else if ``v''<0 {
     loc err 1
     di in red "Arguments must be positive integers."
     }
    }
   if `err'==1 {
    di in red "Please enter data after the command" _c
    di in red " john as follows: vars df N chi"
    exit 198
    }
end

On Thu, Mar 21, 2013 at 5:49 PM, daniel klein <[email protected]>
wrote:
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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