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Re: st: RE: Keeping the upper triangle of a matrix.

From   Philipp Krueger <[email protected]>
To   [email protected]
Subject   Re: st: RE: Keeping the upper triangle of a matrix.
Date   Thu, 20 Jan 2011 19:58:36 +0100

That did the trick. Thank you so much Nick.
Am 20.01.2011 19:26, schrieb Nick Cox:
Sounds like

keep if var1<= var2

[email protected]

Philipp Krueger

I am a bit stuck. I have the following dataset

var1; var2; var3
1; 1; aaa
1; 2; def
1; 3; ghi

2; 1; def
2; 2; aaa
2; 3; klm

3; 1; ghi
3; 2; klm
3; 3; aaa

Essentially, the three row vectors of a 3x3  matrix are stacked
underneath each other in a dataset. Since the matrix is symmetric, I
would like to keep only the observations corresponding to the lower
triangle of the matrix (including the diagonal), i.e. observations
1,2,3,5,6,9 in the dataset. All other observations (i.e. 4 and 8 should
be dropped. I have tried hard but could not find a solution.

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