joris meys wrote:
2 problems :
test seems to be a data frame or list with one variable. So you have
to specify :
as.numeric(test$classcol)
But this will make the internal factor levels the real values, not the
numbers you specified. What you need, is
as.numeric(as.character(test$classcol))
which is prominently mentioned in ?factor as well as in
7.10 of the FAQ.
-Peter Ehlers
Cheers
Joris
On Mon, Oct 19, 2009 at 3:07 PM, John <josip.2...@gmail.com> wrote:
Hello,
I figure this is quite a simple problem really, but since I'm quite
new to R I need to ask:
If I have a data frame:
str(test) :
$ classcol: Factor w/ 3 levels "1","2","3"
How do I convert the entries in this column to numbers. I.e., I want
to be abl to do simple calculations like test[1,the_column] - test
[2,the_column] without errors.
as.numeric(test) yeilds the error "object cannot be coerced to type
'double'"
Thanks!
John
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