Try this:

xtabs(as.numeric(Measure) ~ Show + Datetime, data = DF3)


On Thu, Aug 27, 2009 at 8:04 AM, Tony Breyal <tony.breyal@googlemail.com>wrote:

> Dear all,
>
> Question: How to merge two data frames such that new column are added
> in a particular way?
>
> I'm not actually sure how to best articulate my question to be honest,
> so i hope showing you what I want to achieve will communicate my
> question better.
>
> Lets say I have two data frames:
>
> > DF1 <- data.frame(cbind(Show=c('Firefly', 'Red Dwarf'), Measure=1:2,
> Datetime=c('08/26/2009 9:30 AM', '08/26/2009 9:30 AM')))
>
> > DF2 <- data.frame(cbind(Show=c('Firefly', 'Red Dwarf'), Measure=3:4,
> Datetime=c('08/26/2009 11:30 AM', '08/26/2009 11:30 AM')))
>
> And then let us merge these:
>
> > DF3 <- merge(DF1, DF2, all=TRUE)
>
>       Show         Measure            Datetime
> 1     Firefly         1                      08/26/2009 9:30 AM
> 2     Firefly         3                      08/26/2009 11:30 AM
> 3     Red Dwarf   2                      08/26/2009 9:30 AM
> 4     Red Dwarf   4                      08/26/2009 11:30 AM
>
>
> What i would like to do is merge the data frames such that i end up
> with the following:
>
> Show           08/26/2009 9:30 AM        08/26/2009 11:30 AM
> Firefly          1                                    3
> Red Dwarf    2                                    4
>
> my reason for doing this is so that i can plot a time series somehow.
>
> I hope the formating stays when i post this message and that what i'm
> trying to do is easy to understand. Thank you kindly for any help in
> advance.
>
> Tony
>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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