Re: [R] Extract from matrix

From: John Kane <jrkrideau_at_yahoo.ca>
Date: Fri, 15 Feb 2008 17:36:29 -0500 (EST)


?which

Does something like this help?

which(aa==29)
aa[ -which(aa==29)]

>
> Hi all.
>
> I have certain problem with the extraction of data
> from matrices. I know how
> extract elements from a matrix, but what I would
> like to do is to extract a
> concrete number, not an element. For example if I
> have this matrix X:
>
> [,1] [,2] [,3] [,4]
> [1,] 3 13 23 33
> [2,] 9 19 29 39
> [3,] 10 20 30 40
>
> I can do X[-2] or X[2] in order to eliminate the
> element of the matrix or to
> extract it, respectively.
>
> But, what I need is to extract or to eliminate a
> value of the matrix. For
> example the 29.
>
> Can I do this? How?
>
> Thanks for the help.
> --
> View this message in context:
>
http://www.nabble.com/Extract-from-matrix-tp15502655p15502655.html
> Sent from the R help mailing list archive at
> Nabble.com.
>
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> and provide commented, minimal, self-contained,
> reproducible code.
>



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 15 Feb 2008 - 22:39:27 GMT

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