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Re: st: mata matrix permutation
From
Christophe Kolodziejczyk <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: mata matrix permutation
Date
Mon, 17 Feb 2014 17:30:40 +0100
Dear Yoad
The following piece of code seems to do what you require.
Note the use of rowshape(), vec() and subscripting.
Best
Christophe
clear mata
mata:
a = runiform(1,3000)
r = range(1,3000,1)'
// reshape r such that
/* s =[1 , 2
1001, 1002,
2001, 2002,] */
s = rowshape(r',3)
s[,1..10]
// vectorize and transpose s
s = vec(s)'
s[1,1::10]
s[1,2990::3000]
// rearrange matrix a
b = a[1,s]
// s
// a\b
end
2014-02-17 3:48 GMT+01:00 yoad shefi <[email protected]>:
> I have a matrix in mata that has 3000 columns, but consists of 3
> distinct blocks (each with 1000 columns).
> I'm trying to change the order of the columns so that I get a
> consecutive set of columns one from each block - 1, 1001, 2001, 2,
> 1002, 2002, 3, 1003, 2003 ....., 999,1999,2999, 1000, 2000, 3000.
>
> Is there an easy way to do this in mata?
>
> any help would be appreciated,
>
> Thanks,
> Yoad
> *
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--
Christophe Kolodziejczyk
Research Fellow
AKF, Anvendt KommunalForskning
Danish Institute of Governmental Research
Købmagergade 22
DK-1150 København K
*
* For searches and help try:
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* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/