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st: matrix colnames


From   "Edward F. Blackburne" <blackburne@shsu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: matrix colnames
Date   Tue, 27 Sep 2005 16:26:22 -0500 (CDT)

Hello all,

I have a frustrating problem I know someone can quickly fix.

I am trying to assign colnames to a matrix and I have included a snippet
of code below.

It should be the case (IMHO) that theta_V and theta will have same
colnames, but they don't.

With the code below, theta_V has equation names specified (in this case a
generic c1:) which are NOT in theta matrix.

If I change line 4 in the code below to matrix `theta_V'=J(4,4,1) for
example, the problem disappears and all colnames are as expected.

I have supposed the problem (feature) is that by taking the product of
(tmp'tmp) Stata introduces equation names.

How do I avoid this problem?

***********Code Snippet***************
    local names: colnames `theta'
    matrix `theta_h'=J(1,`n',1/`n')*`theta'
    matrix `tmp'=`theta'-J(`n',1,1)#`theta_h'
    matrix `theta_V'=`tmp''*`tmp'/(`n'*(`n'-1))
    matrix rownames `theta_V'=`names'
    matrix colnames `theta_V'=`names'
*************************************

Thanks in advance,

Ed




Edward F. Blackburne III, PhD
Associate Professor
Economics and International Business
Sam Houston State University
blackburne@shsu.edu
936-294-3934
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