It's in the R-FAQ. I can't remember it's 7.20 or 7.35 but it's in that
general area.
--
David Winsemius
On Mar 4, 2009, at 3:38 PM, Bob Roberts wrote:
Hi,
I formed a 49 by 3 data frame by reading in a text file using
read.table(), and combining it with a matrix that I made by using
unlist() on a list of character strings. I would like to do some
simple arithmetic operations on the elements in the data frame
columns (e.g. column 3/column2) but the values in the data frame are
stored as factors and using stringsAsFactors=FALSE did not work. I
get this error when doing arithmetic operations:
In Ops.factor(dataframe$col3, dataframe$col2) : / not meaningful for
factors
Is there a way to store these values not as factors or convert them
to numeric values? Or a way to do operations on factors in data
frames? I know R has I() but that didn't help in this case. Thanks
so much.
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