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

From   "Nick Cox" <>
To   <>
Subject   st: RE: where did my matrix go after calling -diagt-
Date   Wed, 17 Feb 2010 20:21:03 -0000

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. 



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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