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Re: st: RE: RE: Two-word commands with gettoken


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: RE: Two-word commands with gettoken
Date   Mon, 9 Mar 2009 00:09:55 +0100

<>

Of course, you could enumerate all the possiblities... Also note the command -unabcmd-...

HTH
Martin
_______________________
----- Original Message ----- From: "Augusto Cadenas" <aug.cadenas@googlemail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, March 08, 2009 11:55 PM
Subject: Re: st: RE: RE: Two-word commands with gettoken


Nick, thanks for your comments, immensely useful as usual. (Thanks for
your comments, Sergyi, too). This helped me out.

Thanks for pointing out the reg/regress issue. How would I specify the
-if- condition in a more flexible way, so that it accepts anything
between -reg- and -regress-? Is there some way of using wildcards?

Best, AC

On Sun, Mar 8, 2009 at 3:08 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
Orthogonal to this, this seems to commit any user wanting -regress- to abbreviating it as -reg-. If you are the user and want that, so be it.

Nick
n.j.cox@durham.ac.uk

Nick Cox

I wouldn't use globals here, or indeed almost anywhere else.

Anyone watching needs to know that local macro 0 is special; it is born as whatever the user types after the command line. It can be redefined, as here with -gettoken-.

A little inelegant, but practical, is to do something like this:

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

and then parse away.

Alternatively, don't use -gettoken- at all. That sounds better.

program define mycmd
local subcmd : word 1 of `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

Nick
n.j.cox@durham.ac.uk

Augusto Cadenas

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.

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