Right, but I wanted
syntax varname1 varname2 [if] [in] [, noconstant]
so I typed
syntax varlist(min=2 max=2 numeric) [if] [in] [, noconstant]
tokenize `varlist'
local varname1 `1'
local varname2 `2'
I was just curious why -syntax' isn't smart enough not to be confused
about the option commas not being separating by white space. The code
below is not smart enough.
syntax varlist(min=2 max=2 numeric) [if] [in] [, noconstant]
// tokenize `varlist'
local varname1 `1'
local varname2 `2'
Incidentally, this is related to exercises in one of the Stata
courses. Since I got this to work, and Stata instructors don't work
weekends, I'm posting here. So I hope this is not classified as
posting homework! :)
-Dave
On Oct 19, 2008, at 10:24 AM, Kit Baum wrote:
< >
Dave said
I have not used syntax much. When I write the syntax command,
syntax varlist(min=2 max=2 numeric) [if] [in] [, noconstant]
I find it parses
mycommand weight weight2 , constant
differently than
mycommand weight weight2, constant
The top parses `2' to weight2 and the bottom parses `2' to weight2,
(includes the comma). Use of tokenize varlist avoids this problem, but
is it a long standing feature of syntax to require option commas to be
separated by white space? I can't remember being careful about how I
type that interactively.
Rather than using numbered macros with -syntax-, just use the
returned -varlist-:
program dave
syntax varlist(min=2 max=2 numeric) [if] [in] [, noCONStant]
di " varlist is `varlist'"
di " constant is `constant'"
end
sysuse auto,clear
dave price mpg , cons
dave price mpg,nocons
dave price mpg , nocons
Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html
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