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st: vec of upper triangle


From   Edwin Leuven <e.leuven@uva.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: vec of upper triangle
Date   Wed, 09 Aug 2006 13:54:32 +0200

hello,

i was wondering whether anyone is aware of a good (fast) way of putting the upper triangle of a square matrix into a vector?

example:

1 2 3
2 4 5
3 5 6

into:

1
2
4
3
5
6

or

1
4
6
2
5
3

or

1
2
3
4
5
6

?

thanks!

edwin

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