Look this can help you:
mtz<-matrix(1:20,4,5)
> mtz
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    5    9   13   17
[2,]    2    6   10   14   18
[3,]    3    7   11   15   19
[4,]    4    8   12   16   20
> mtz[2,3]
[1] 10
> mtz
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    5    9   13   17
[2,]    2    6   10   14   18
[3,]    3    7   11   15   19
[4,]    4    8   12   16   20
> mtz[2,3]<-NA
> mtz
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    5    9   13   17
[2,]    2    6   NA   14   18
[3,]    3    7   11   15   19
[4,]    4    8   12   16   20
Best rgrds


*-------------------------------------*

* *

*J. Arturo Coral Alamo*
Consultor

Business Analytics SAC


Telf: (51-1)    222-4091

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On Fri, Feb 15, 2008 at 11:10 AM, _Fede_ <r_stat_solutions@hotmail.es>
wrote:

>
> 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<http://nabble.com/>
> .
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Saludos cordiales
J Arturo Coral

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