Agustin Lobo-4 wrote:
>
> Given
> > str(x)
> 'data.frame': 5284 obs. of 5 variables:
> $ COD : chr "0800101001" "0800101002" "0800101003" "0800101004" ...
> $ 0-4 : num 79 215 84 58 127 134 15 122 101 99 ...
> $ 5-9 : num 76 180 32 56 81 106 10 112 128 96 ...
> $ 10-14: num 68 145 39 46 78 81 8 92 142 107 ...
> $ 15-19: num 73 170 49 52 103 77 10 116 129 129 ...
>
> I get
>
> > str(data.matrix(x))
> num [1:5284, 1:5] 8e+08 8e+08 8e+08 8e+08 8e+08 ...
> - attr(*, "dimnames")=List of 2
> ..$ : chr [1:5284] "3" "6" "9" "12" ...
> ..$ : chr [1:5] "COD" "0-4" "5-9" "10-14" ...
>
> Should not data.matrix() return a numeric matrix?
>
>
It does, only the dimnames are non-numeric, and you first column is a little
ugly in floating point because the numbers are so big. Do you really want to
convert these to doubles?
Try
dm= data.matrix(x)
dm[,2]
which probably looks quite good.
Dieter
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