On May 3, 2010, at 6:22 PM, vincent.deluard wrote:
Hi there,
This will sound very stupid because I just started using R but I see
you had
similar problems.
I just loaded a very large dataset (2950*6602) from csv into R. The
format
is ticker=row, date=column.
Not a particularly precise description of what is in the data.
Every time I want to compute basic operations, R returns "In
Ops.factor: not
meaningful for factors"
Code .... we want to see code. All of it.
I believe it is because R does not read the data as numbers
Probably true. Were they dates or numbers?
but I am not
sure. Can anybody help?
I generally read in my data with read.table( ,,,,, as.is=TRUE,
stringsAsFactors=FALSE, ....) and then convert the columns that I know
should be numeric with as.numeric. If all of your columns should have
been numeric, you might use the colClasses argument, perhaps along
these lines:
rd.obj <- read.csv(file="something", colClasses= rep("numeric",
<number-of-columns>) )
--
David Winsemius, MD
West Hartford, CT
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