Kit,
Thanks very much for your response.
I can follow what you did with the variables, but I can't get it to work. I
think my failure to implement it is because I have never used mata. I am
away from my office for an extended period, and don't have my mata manual
with me. If you had time, I am interested in knowing how to run your
approach from inside a do file.
When I put it into a do file, I got the following error messages, and the
line -di "`revvars'"- failed. I thought perhaps your mata section was meant
to be run interactively, but interactively I still got an error when I got
to the line:
-v2=invtokens(v[cols(v)..1])-
Here is what I got:
. sysuse auto, clear
(1978 Automobile Data)
r; t=0.00 7:46:57
. forvalues i = 1/10 {
2. gen x`i' = uniform()
3. }
r; t=0.02 7:46:57
.
. unab vars : x*
r; t=0.00 7:46:57
.
. // this places the list of x* variables in macro vars
.
. mata
------------------------------------------------- mata (type end to exit)
------------------------------------
: v=tokens(st_local("vars"))
:
: v2=invtokens(v[cols(v)..1])
<istmt>: 3499 invtokens() not found
r(3499);
:
: st_local("revvars",v2)
<istmt>: 3499 v2 not found
r(3499);
:
:
:
: v2
<istmt>: 3499 v2 not found
r(3499);
:
: end
----------------------------------------------------------------------------
----------------------------------
r; t=0.05 7:46:57
.
. di "`revvars'"
r; t=0.00 7:46:57
.
end of do-file
r; t=0.06 7:46:57
Buzz
Buzz Burhans, Ph.D.
Dairy-Tech Group
Twin Falls, ID
Phone: 208-320-0829
Fax: 208-735-1289
Email: [email protected]
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Kit Baum
Sent: Tuesday, July 17, 2007 5:58 AM
To: [email protected]
Subject: st: Re: reverse variable order
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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