[R] Extract from matrix

[_Fede_]

Thank you all for your help.

Fede


_Fede_ 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.
> 

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