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
[email protected]
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
[email protected]
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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