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


From   Nathan Danneman <ndanneman@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: generate an error message if the wrong number of args is given following the args command
Date   Tue, 30 Jun 2009 10:58:37 -0400

Nick, thanks for the crafty solution.

N

On Tue, Jun 30, 2009 at 7:36 AM, Nick Cox<n.j.cox@durham.ac.uk> wrote:
> Thanks for this, but also please note the request in the FAQ to close threads publicly.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: Nathan Danneman [mailto:ndanneman@gmail.com]
> Sent: 29 June 2009 22:49
> To: Nick Cox
> Subject: Re: st: RE: RE: generate an error message if the wrong number of args is given following the args command
>
> Ah, adding an extra argument, and making sure it is blank.  A nice
> trick - thanks!
>
> On Mon, Jun 29, 2009 at 4:07 PM, Nick Cox<n.j.cox@durham.ac.uk> wrote:
>> Another common technique is just to count.
>>
>> if `: word count `0'' != 1 error 198
>>
>> Note that Stata's definition of words includes explicitly quoted strings
>> as single words.
>>
>> If a program took a string message and a number value as in
>>
>> program nathan
>>        version 11
>>        args message answer
>>        di as txt "`message' " as res `answer'
>> end
>>
>> nathan "the answer is" 42
>>
>> -word count `0'- would still count the number of arguments to be 2.
>>
>> Nick
>> n.j.cox@durham.ac.uk
>>
>> Nick Cox
>>
>> I often do something like this
>>
>> program example
>>        version 10.1
>>        args factor garbage
>>        if "`factor'" == "" | "`garbage'" != "" {
>>                error 198
>>        }
>>
>> You can approach this in other ways, but I find this to be among the
>> most transparent.
>>
>> Nick
>> n.j.cox@durham.ac.uk
>>
>> Nathan Danneman
>>
>> 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
>>
>>
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
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>>
>
>
>
> --
> "Imagination is more important than knowledge..."
>      -- Albert Einstein
>



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

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