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st: Re: RE: absolute values of matrix elements [stata 8]


From   "R.E. De Hoyos" <redeho@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: RE: absolute values of matrix elements [stata 8]
Date   Tue, 15 Nov 2005 09:37:44 -0000

Thanks Nick.

Rafa

----- Original Message ----- From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, November 11, 2005 5:36 PM
Subject: st: RE: absolute values of matrix elements [stata 8]



I think you are looking at the wrong package. -matewmf- will
do this. It is more entertaining to write your own
as a couple of -forval- loops.

STB-56 dm79 . . . . . . . . . . . . . . . . . . Yet more new matrix commands
(help matcorr, matewmf, matvsort, svmat2 if installed) . . N. J. Cox
7/00 pp.4--8; STB Reprints Vol 10, pp.17--23
commands to produce a correlation matrix, elementwise monadic
function of another matrix, selected subsets of matrix rows
and columns, vec or vech of a matrix, elements sorted within
a vector, matrix from a vector, and commands to save matrices

. mat a = (1,2,-2,-1)

. matewmf a b, f(abs)

. mat li b

b[1,4]
c1 c2 c3 c4
r1 1 2 2 1

Nick
n.j.cox@durham.ac.uk

R.E. De Hoyos


I am trying to transform a matrix A into matrix B where B's
elements are the abolute values of A's.

B[i,j] =  | A[i,j] |

I found Nick's -matodd- but it seems not to have an -abs- elementwise
option.
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