[R] Reorganize data fram

[David Winsemius]

On Jul 12, 2011, at 8:42 AM, anglor wrote:

> Hi,
>
> I have a data frame of about 700 000 rows which look something like  
> this:
>
> Date        Temperature  Category
> 2007102   16                   A
> 2007102   17                   B
> 2007102   18                   C
>
> but need it to be:
>
> Date          TemperatureA  TemperatureB   TemperatureC
> 2007102       16                 17                    18

 > reshape(dat, idvar="Date", timevar="Category", direction="wide")
      Date Temperature.A Temperature.B Temperature.C
1 2007102            16            17            18


>
> Any suggestions?
>
> /Angelica
>
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David Winsemius, MD
West Hartford, CT