[R] convert data.frame to matrix -> NA factor problem

[syrvn]

Thanks again for your quick reply.

I understood your procedure but now it is even more strange why my
conversion does not work.
In your example, the NA values are in "brackets" <NA> and what your
procedure does is to
convert these <NA> values into NA and then it seems to be possible to use
data.matrix to
correctly convert the data.frame into a data.matrix. But the data I read
into R are already in that
form that the NA values are displayed as NA rather than <NA>. So the
conversion should actually work.

Cheers
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