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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