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st: Re: reverse variable order


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: reverse variable order
Date   Tue, 17 Jul 2007 07:57:42 -0400

To somewhat simplfy Maarten's code (without the check for x following a strict pattern, which in fact is not required in this approach), see below

On Jul 17, 2007, at 2:33 AM, Maarten wrote:


*---------- begin example --------------
sysuse auto, clear
forvalues i = 1/10 {
	gen x`i' = uniform()
}

unab vars : x*
// this places the list of x* variables in macro vars

. mata

: v=tokens(st_local("vars"))

: v2=invtokens(v[cols(v)..1])

: st_local("revvars",v2)

:
: v2
x10 x9 x8 x7 x6 x5 x4 x3 x2 x1

: end
------------------------------------------------------------------------ --------

. di "`revvars'"
x10 x9 x8 x7 x6 x5 x4 x3 x2 x1

// Back in Stata, the local macro revvars now contains the reversed list of x variables. No need to loop. -order- can be applied to this list (prepended with the list of non-x variables, extracted as Maarten illustrates).

Kit *
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