Hi:
df <- read.table(textConnection("
+ xloc yloc yield
+ 1 10 12 95
+ 2 11 10 81
+ 3 12 11 20
+ 4 12 11 10"), header = TRUE)
with(df, xtabs(yield ~ yloc + xloc))
xloc
yloc 10 11 12
10 0 81 0
11 0 0 30
12 95 0 0
HTH,
Dennis
On Tue, Feb 22, 2011 at 11:30 PM, Nicolas Gutierrez <nicol...@uw.edu> wrote:
> Hi all (again),
>
> I have a data frame "pop":
>
> xloc yloc yield
> 1 10 12 95
> 2 11 10 81
> 3 12 11 20
> 4 12 11 10
>
> And I want to get the sum of yield for the cell (pop$xloc, pop$yloc) in a
> matrix as follows:
>
> xloc
> 10 11 12
> 10 0 81 0
> yloc 11 0 0 30
> 12 95 0 0
>
>
> Any ideas? thanks!
>
> Nico
>
> ______________________________________________
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