[R] Problem with a Matrix

[John Kane]

I think this is what you want.
library(reshape2)
dcast( xx, Site.No ~ Plant.Name)

John Kane
Kingston ON Canada


> -----Original Message-----
> From: medo_botany at hotmail.com
> Sent: Thu, 8 Mar 2012 01:20:42 -0800 (PST)
> To: r-help at r-project.org
> Subject: [R] Problem with a Matrix
> 
> Dear All,
> 
> I have a problem in making a matrix from a data. I did a summary data
> from a
> big data frame using (ddply), the resulting table is like that:
> 
> Site.No    Plant.Name    Cover.Percentage
> 1                XXX                15
> 1                YYY                 20
> 2                XXX                18
> 2                YYY                 21
> 3                XXX                14
> 3                YYY                 26
> 
> I need to convert it to the following:
> 
>         XXX      YYY
> 1      15        20
> 2      18        21
> 3      14        26
> 
> I tried for the whole day yesterday but I can't solve it. Could you
> please
> help me.
> 
> Thanks in advance for all of you,
> Hamada
> 
> --
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> 
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