[R] Extract from matrix

[_Fede_]

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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