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st: Two-word commands with gettoken


From   Augusto Cadenas <aug.cadenas@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Two-word commands with gettoken
Date   Sat, 7 Mar 2009 15:09:00 -0500

Hello,

I have a question about -gettoken- and programming in Stata. The stata
help file suggests that -gettoken- can be used to create a two-word
command. This is the example that is given:

*** begin example ***

        program define mycmd
                gettoken subcmd 0: 0
                if "`subcmd'"=="list" {
                        mycmd_l `0'
                }
                else if "`subcmd'"=="generate" {
                        mycmd_g `0'
                }
                else    error 199
        end

        program define mycmd_l
                ...
        end

        program define mycmd_g
                ...
        end

*** end example ***

I wonder how I could use the `subcmd' that has been determined by the
first program, -mycmd-, within the sub-programs -mycmd_l- and
-mycmd_g- without referring to it explicitly. To make a concrete
example: In my case I want a program to do two similar, but slightly
different things depending on whether I am doing an OLS regression or
an IV regression. So the setup I have in mind is like:

*** begin example ***

        program define mycmd
                gettoken subcmd 0: 0
                if "`subcmd'"=="reg" | "`subcmd'"=="areg" |
"`subcmd'"=="xtreg" {
                        mycmd_ols `0'
                }
                else if  "`subcmd'"=="ivreg" | "`subcmd'"=="xtivreg" |
"`subcmd'"=="ivreg2" | "`subcmd'"=="xtivreg2" {
                        mycmd_iv `0'
                }
                else    error 199
        end

        program define mycmd_ols
                ...
                `subcmd' `0'
                ...
        end

        program define mycmd_iv
                ...
                `subcmd' `0'
                ...
        end

*** end example ***

But this does not work, I guess because `subcmd' is not recognized
within the next program. How do I get around that? It's two days I'm
trying and I haven't found a solution. Thanks for any suggestions.

AC
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