[R] extract half a matrix
Emmanuel Paradis
paradis at isem.univ-montp2.fr
Thu May 22 17:16:09 CEST 2003
At 16:55 22/05/2003 +0200, vous avez écrit:
>Dear all,
>
>I'm new to matrix operations in R. I couln't find a solution to the
>following problem among earlier help mails or in An introd to R, I guess
>because the question is really basic.
>
>I want to extract all above the diagonal, i.e. from
>
> 1 2 3 4
>1 0 26 49 49
>2 26 0 44 40
>3 49 44 0 21
>4 49 40 21 0
>
>I want
>
>26
>49
>44
>49
>40
>21
If your matrix is named M, this should do it:
M[row(M) < col(M)]
EP
>Thanks in advance!
>
>
>Sincerely,
>Tord
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