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Re: st: subsetting a matrix by rowname and column name


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: subsetting a matrix by rowname and column name
Date   Sun, 22 Mar 2009 10:20:08 +0000 (GMT)

--- On Sat, 21/3/09, Jacob Wegelin wrote:
> I'd ideally like to extract a scalar by row and column name,
> since this would be less error-prone.

You can get the indexes using the -rownumb()- and -colnumb()-
functions, and feed these to the -el()- function, like in the
example below

*------- begin example -----------
sysuse auto, clear
reg price mpg foreign
matrix v = e(V)
matrix list v
tempname foo
scalar `foo' = el(v,  ///
  rownumb(v,"_cons"), ///
  colnumb(v,"_cons"))
di `foo'
*------- end example --------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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