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Re: st: re: syntax


From   David Airey <david.airey@Vanderbilt.Edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: re: syntax
Date   Sun, 19 Oct 2008 10:37:44 -0500

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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