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

[Simone Angioloni <sangiol@uga.edu>]

Hi Nick,

I did it, but it does not work.

mymat=(0,3,2,4\3,0,1,6\2,1,0,5\4,6,5,0)
sort(mymat', 1)'

And this is the output:
         1   2   3   4
    +-----------------+
  1 |  0   2   3   4  |
  2 |  3   1   0   6  |
  3 |  2   0   1   5  |
  4 |  4   5   6   0  |
    +-----------------+

I do not need to sort only the first row, but all the rows like this:
         1   2   3   4
    +-----------------+
  1 |  0   2   3   4  |
  2 |  0   1   3   6  |
  3 |  0   1   2   5  |
  4 | 0    4   5   6  |
    +-----------------+

Thanks.

Simone
________________________________________
From: owner-statalist@hsphsun2.harvard.edu <owner-statalist@hsphsun2.harvard.edu> on behalf of Nick Cox <njcoxstata@gmail.com>
Sent: Monday, February 24, 2014 12:54 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: RE: Sorting rows in Mata

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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