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

["R.E. De Hoyos" <redeho@hotmail.com>]

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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