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Hi all, is it possible to modify the way a graph obtained through image(graphics) is filled, I mean starting filling the graphical matrix by row from the upper-left rather than by the lower-left cell... In many cases, it can be usefull to have a representation of the data spatialy corresponding to a real support, as it is the case with the function image(marray) from Bioconductor packages, which fills the graphical matrix by row from upper-left, but just handles marrayRaw or marrayNorm objects. Of course, I could reorder the matrix, but it's heavier than with an already...

...apname_in_grass") # 2) a catchment map which divide the area in several catchements catchment<-readRAST6("catchement_mapname_in_grass") # 3) a precipitation map precipitation<-readRAST6("precipitation_mapname_in_grass") # then I would like to sum the precipitation spatialy over each catchment and landuse. So, first I cbind all maps with cbind MAP<-cbind(landuse,catchment,precipitation) # then I use the aggregate function SUM<-aggregate(MAP[3],by=list(MAP[1],MAP[2]),sum,na.rm=TRUE) # here is the problem !!! Error in as.vector(x, mode) : invalid argument 'm...