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st: AW: RE: RE: RE: RE: RE: where did my matrix go after calling -diagt-


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: RE: RE: RE: RE: RE: where did my matrix go after calling -diagt-
Date   Thu, 18 Feb 2010 15:44:36 +0100

<> 

" The revised program is your responsibility"



Weirdly enough, one of the first lines of -diagti- says

*************
set trace off
*************

which added significantly to the time it took me to get to the bottom of
Moleps` problem. So killing that line may make sense if you are planning to
clone your own version anyway...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nick Cox
Gesendet: Donnerstag, 18. Februar 2010 15:39
An: statalist@hsphsun2.harvard.edu
Betreff: st: RE: RE: RE: RE: RE: where did my matrix go after calling
-diagt-

Agreed that the finger does point in that direction. The implications for
Moleps appear to be one or both of 

1. Use some other method for storing results. 

2. Clone -diagti- and try changing the line -clear- to -version 10: clear-.
The revised program is your responsibility! 

Nick 
n.j.cox@durham.ac.uk 

Martin Weiss

-preserve- does not seem to have much of an effect in this example, though:

*******
mat a=(1,1)
mat l a

preserve
vers 9: clear
restore

mat l a
*******

Nick Cox

But that -clear- is preceded by -preserve-, so I'm not sure that's it. 

Nick 
n.j.cox@durham.ac.uk 

Martin Weiss

" Somewhere along that chain, matrices are being cleared."

-diagti- says: -clear- in its line 228, which these days would not hurt
Moleps' matrices. Yet in this case, -diagt- being old, it is called under
-version- 9 where a destruction of matrices was still part of -clear-`s
duties...

Nick Cox

You've got much more than that going on. -diagt- calls -diagti- which calls
many other things, and so on. 

Somewhere along that chain, matrices are being cleared. 

It's not your problem below, but I did notice that -diagt- overwrites any
existing matrix called T. As it destroys such a matrix any way, that's
incidental, but using a temporary name would be widely considered better
practice. 

Nick 
n.j.cox@durham.ac.uk 

moleps

I´m creating a table using diagt (available from ssc) for different cutoff
values of p. However the matrix is lost after calling diagt (version 2.0.5)
and the same happens using this example-code:

(stata v10.1)

(ssc install diagt)
sysuse auto.dta
gen ind=price>10000
diagt ind foreign
mat a=(r(sens),r(spec))
mat list a
diagt ind foreign
mat dir

viewsource diagt.ado --no reference as far as I can tell to dropping of
matrices...Neither with diagti.

There is a previous post with diagt for bootstrap purposes, but there is no
reference to dropping of matrices.


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