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st: Matrix calculation


From   "Jiang, Tao" <TJiang@air.org>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: Matrix calculation
Date   Fri, 6 Sep 2002 15:57:16 -0400

I was doing some matrices calculation, but got some problem.  What I had is
a simple matrix:

A = (1,2\2,1)

and if I do B = inv(A), I got the correct matrix; if I do B = syminv(A),
I got the following:

. mat A = (1,2\2,1)
. mat list A

symmetric A[2,2]
    c1  c2
r1   1
r2   2   1
. mat iA=syminv(A)

. mat list iA

symmetric iA[2,2]
    r1  r2
c1   1
c2   0   0

Is there some reason why?
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