On Jul 20, 2010, at 8:41 AM, David Winsemius wrote:
On Jul 20, 2010, at 7:33 AM, Sarah Chisholm wrote:
Hi,
I have a problem with the time formatting in R. I have entered time
in the format "MM:SS.xyz" and R has automatically classified this
as a factor, but I need it numerically. However when I use
as.numeric() it gives me totally different numbers. Is there any
way I can tell R to read thes input as a number?
There are ways using As methods of doing so, but I think those is a
bit more complex than a learner at you level should be asked to
implement. Guessing that you used one of the read functions to bring
in the data (or possibly used hte data.frame function) , you are
probably experiencing the effects of the default
stringAsFactors=TRUE behavior. Try setting stringsAsFactors to
FALSE. Then you can use the standard Date functions:
?Dates
I should have said:
? DateTimeClasses
--
David Winsemius, MD
West Hartford, CT
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