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Re: st: RE: RE: Sorting rows in Mata


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: RE: Sorting rows in Mata
Date   Mon, 24 Feb 2014 17:54:12 +0000

The -sort()- function (not command) can do this for you, with
transposes before and after:

: sort(mymat', 1)'

Nick
njcoxstata@gmail.com

Simone Angioloni

> I knew this command, but it seems not perfectly fit.
>
> My matrix is like this:
>
> mymat=(0,3,2,4\3,0,1,6\2,1,0,5\4,6,5,0)
>
> and I need something like:
>
> 0,2,3,4
> 0,1,3,6
> 0,1,2,5
> 0,4,5,6

Andrew Maurer

> Is mata's sort() function what you're looking for? Try "help mata sort()"
>
> Eg:
> mata
> mymat = (3 \ 1 \ 4 \ 2), (6 \ 7 \ 8 \ 9)
> mymat
> sort(mymat,1)
> end

Simone Angioloni

> Is there a canned command to sort rows in ascending order in Mata without exporting the matrix to Stata and using the rowsort()?
>
> I need to do that in Mata because the marix is very large (more than 1000 by 1000) and once I export the matrix to Stata I have rounding errors that make the matrix slightly different from the original.
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