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st: Re: basic matrix definition question


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: basic matrix definition question
Date   Tue, 16 Oct 2007 06:21:35 -0400

Doing something like this in Stata's matrix language is IMHO an exercise in frustration (and punctuation). Per my recent posting on solving nonlinear equations, you would be much better off setting up the problem in Mata, making use of -optimize-.


Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


On Oct 16, 2007, at 2:33 AM, statalist-digest wrote:


Thanks very much.  I totally missed the mkmat command in the manual.
Although I probably made the example too simple, I am trying to write
a program to solve for two equations in two unknowns so I am building
a partial derivative matrix for inverting.  I calculate each of the 4
partials as variables and then combine them into a matrix.  I was
stuck on the create matrix step.  Using local macros worked as well
with a matrix command.  I assume that I would need to first create two
column vectors from 2 of the four variables and then combine these
with another mkmat command.
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