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st: Mata query

From   Kit Baum <>
Subject   st: Mata query
Date   Wed, 2 May 2007 10:21:58 -0400

sacrificial lamb

Ade wonders what

select(0,1) versus select(0,0) does.


a = select(0,1)
b = select(0,0)
mata describe

and you will see that the first returns a scalar, whilst the second returns a matrix b[0,0]. I believe that is what is known as a void matrix. Examining the help for void matrices might be useful. Also compare to standard Stata function nullmat().

Kit Baum, Boston College Economics and DIW Berlin
An Introduction to Modern Econometrics Using Stata:

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