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st: RE: options in stata


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: options in stata
Date   Fri, 8 Jul 2005 00:15:23 +0100

If -t- has been input, it is a non-empty string, 
so I would program this something like 

if "`t'" != "" { 

} 
else { 

} 

Or, more likely, I would fill in a default: 

if "`t'" == "" local t "1 2 3" 

Thus, the key is to exploit the fact that 
such an option has no default and thus is 
empty if and only if the user didn't specify it. 

Nick 
[email protected] 

NEYMOTIN, FLORENCE
 
> how do you refer to an option for a number list?  for instance, 
> suppose I write an .ado file where t(numlist) is an OPTIONAL 
> element, so the user could input t(10 
> 20 30 40 50) or no t at all.  If I want to write a 
> case-selection statement that looks like:
> 
> if t has been input by the user {
> ...
> }
> else {
> ...
> }
> 
> then what is the REAL code for the if-statement here?

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