[R] How to doulbe all the value on a matrix

[ADias]

Hi,

yes it works perfectly.

I have another question:

Is there way of selecting with a vector the values I wish to take out from a
matrix.

Example:

I have this matrix and I want to take out the numbers in bold and get the
second matrix below

>m
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]   17    1    6    5   19    2   19    1   15     8
 [2,]    7    7   20    3    2   16    9    9   19    13
 [3,]    2    4    3   11   18   11   14   13    3     1
 [4,]    3    7    5    7   17   18   10    6    5    15
 [5,]    8   20   13   10    8   12   20   19    1    16
 [6,]    9   14    1   12   12   12   17   18   10    17
 [7,]    3   10   11    2   12    9   18    6   19     9
 [8,]   13    2   17   16   18    8    9   14    9    16
 [9,]    9    4   11    4    1   17    9    7   20    12
[10,]    9    1    4    8    8   19   19    8   17    18

     [,1] [,2] [,3] [,4]
[1,]    7    3   16    9
[2,]    3    2    9   18
[3,]   13   16    8    9

thanks
AD

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