Tuesday, September 10, 2002, 1:30:16 AM, you wrote:
> --Hung-Jen Wang <[email protected]> wrote:
> To work around the problem, Hung-Jen may try -myopt(passthru)-. See the
> following example:
> program define myexpl
> version 6
> syntax [, myopt(passthru)]
> if "`myopt'" != "" {
> di "myopt is: `myopt'"
> tokenize `myopt', parse("()")
> local myopt `3'
> summ `myopt'
> }
> else {
> di "myopt() is empty"
> }
> end
Thank Weihua for the near-perfect solution to my problem arising from
running the codes in Stata 6 (executable). The only quirk left though
is that the program does not accept space as a legitimate empty option
value. That is, suppose I want the option value of -myopt- to be
empty, myexpl, myopt()
is fine, but
myexpl, myopt( )
isn't (note the space in the option). Stata actually treats it as a
non-empty option value, resulting in undesired parsing which returns
")" (no quotes) as the parsed value of -myopt-.
To fix the small oddity, after
tokenize `myopt', parse("()")
local myopt `3'
I can do the check again,
if "`myopt'" == ")"{
local myopt ""
}
Or is there a more elegant solution? Including the space as a parsing
delimiter solves the problem but creates another, when non-empty
varlist containing spaces between the variable names are specified in
myopt(..).
HJW
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