[R] help with data layout

[Henrique Dallazuanna]

Try this:

#x <- read.csv('your_file.csv')

x$Col1 <- rep(as.character(x$Col1[x$Col1!="" ]),
              each = unique(diff(which(x$Col1 != ""))))
with(x, sapply(c(sd, mean), function(x)tapply(Col2, Col1, x)))

On Thu, Jul 17, 2008 at 12:50 PM, Iain Gallagher
<iaingallagher at btopenworld.com> wrote:
> Hello list
>
> I have been given some Excel sheets with data laid like this:
>
> Col1    Col2
> A         3
>           2
>           3
> B         4
>           5
>           4
> C         1
>           4
>           3
>
> I was hoping to import this into R as a csv and then get the mean and SD for each letter in column 1.
>
> Could someone give me some guidance on best to approach this?
>
> Thanks
>
> Iain
>
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>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O