Hi:
Try the cast() function in the reshape package. Using d as the name of
your data frame,
library(reshape)
cast(d, Date ~ Category, value = 'Temperature')
Date A B C
1 2007102 16 17 18
HTH,
Dennis
On Tue, Jul 12, 2011 at 5:42 AM, anglor <angelica.ekens...@dpes.gu.se> 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
>
> Any suggestions?
>
> /Angelica
>
> --
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