[R] Subset POSIXlt Field

[Phil Spector]

Jared -
     The value "2010-08-17" is a character value, and your dates
are stored as POSIXlt values.  So you'd need to use

        Date == as.POSIXlt("2010-08-17")

in your subset statement.

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Tue, 5 Oct 2010, Jared Stabach wrote:

> Hello All
>
> I, for the life of me, can't figure out to subset my dataframe by my Date
> field.  The field has been formatted as POSIXlt.
>
> str(wild)
> ......
> $ Date        : POSIXlt, format: "2010-05-28" "2010-05-28" "2010-05-28" ...
>
> This doesn't work:
> test <-subset(wild,ID=="2830" & Date=="2010-08-17")
>
> which returns:
> <0 rows> (or 0-length row.names)
>
>
> I don't think this should be a difficult thing to do.  I just can't sort out
> the syntax of what it requires and can't find any threads on it.
>
> Any help is be appreciated.
>
> Jared
>
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>
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