Hello friends of R, My name is Toni, i'm 25 and I'm working on the Meteorological Investigation team from Balearic Islands.
I had contact to you because I have a problem: I done a file for every day since 1912 about precipitation. That file has the following structure: > str(Ast) Loading required package: sp Formal class 'SpatialPixelsDataFrame' [package "sp"] with 7 slots ..@ data :'data.frame': 499105 obs. of 2 variables: .. ..$ PRECIP.pred: num [1:499105] 0.000536 0.000536 0.000536 0.000536 0.000536 ... .. ..$ PRECIP.var : num [1:499105] 1.90e-05 1.90e-05 1.90e-05 1.90e-05 1.90e-05 ... ..@ coords.nrs : num(0) ..@ grid :Formal class 'GridTopology' [package "sp"] with 3 slots .. .. ..@ cellcentre.offset: Named num [1:2] 345 4278 .. .. .. ..- attr(*, "names")= chr [1:2] "x" "y" .. .. ..@ cellsize : Named num [1:2] 0.1 0.1 .. .. .. ..- attr(*, "names")= chr [1:2] "x" "y" .. .. ..@ cells.dim : Named int [1:2] 2684 1600 .. .. .. ..- attr(*, "names")= chr [1:2] "x" "y" ..@ grid.index : int [1:499105] 2468192 2468193 2468194 2468195 2465507 2465508 2465509 2465510 2465511 2465512 ... ..@ coords : num [1:499105, 1:2] 505 505 505 505 505 ... .. ..- attr(*, "dimnames")=List of 2 .. .. ..$ : NULL .. .. ..$ : chr [1:2] "x" "y" ..@ bbox : num [1:2, 1:2] 345 4278 614 4438 .. ..- attr(*, "dimnames")=List of 2 .. .. ..$ : chr [1:2] "x" "y" .. .. ..$ : chr [1:2] "min" "max" ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slots .. .. ..@ projargs: chr "+proj=utm +zone=31 +units=km" This is a single file for one specific day. Now, I must to sum the precipitation of every day from every file like this. I must to do the annual precipitation for every year. How can I take the precipitation ( PRECIP.pred) of every day and sum it with all at same time? maybe a loop? Thanks so much for your time. Toni ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
