[R] Help with time in R

[David Winsemius]

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