search for: era40na

...owing difficulty. I am running R on a iMac G5 with OS 10.4. The file below (73 rows x 144 col) shows the values of a climatic index on the globe with a grid of 2,5 ? x 2,5 ? (NA = no value): ? With image() and map() and running the following function: dessin_i<-function(nomfichier="ERA40NA.dat",lat=73,long=144) { #d?finition de la fonction library(maps) a <- read.table(nomfichier) #lecture du fichier z <- array(0,dim=c(long,lat)) #cr?ation d'un tableau de 0 z <- t(a) #transposition de la matrice a en z z1<-rbind(z[65:long,],z[1:64,]) #centrage de la carte sur gr...