Nick, thanks for the crafty solution.
N
On Tue, Jun 30, 2009 at 7:36 AM, Nick Cox<[email protected]> wrote:
> Thanks for this, but also please note the request in the FAQ to close threads publicly.
>
> Nick
> [email protected]
>
>
> -----Original Message-----
> From: Nathan Danneman [mailto:[email protected]]
> 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<[email protected]> 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
>> [email protected]
>>
>> 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
>> [email protected]
>>
>> 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
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
>
>
> --
> "Imagination is more important than knowledge..."
> -- Albert Einstein
>
--
"Imagination is more important than knowledge..."
-- Albert Einstein
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
