[R-sig-Geo] group data into squares

[Luis Ridao Cruz]

R-sig-geo-help,

I have locations of fish abundance
which I want to aggregate into squares.

The code below creates the grid:


library(sp)
test <- GridTopology(c(-10.5,60),c(0.1,0.1),c(67,35))
coordinates(test)
coordinatevalues(test)
yy <-SpatialGrid(grid=test)
plot(yy,pch=16,cex=0.3,col=1)

and within each cell the total abundance of fish
should be specified.

How can I do this?


Thanks in advance


> version
               _                           
platform       i386-pc-mingw32             
arch           i386                        
os             mingw32                     
system         i386, mingw32               
status                                     
major          2                           
minor          4.0                         
year           2006                        
month          10                          
day            03                          
svn rev        39566                       
language       R                           
version.string R version 2.4.0 (2006-10-03)
>