Hi, All: I am using Chinese version of R, but I will translate the error message. I have been trying to find out the spatial pattern of some meteorology variable. I converted the data from "grib" format to binary, which is not a big deal. Then I read in the binary data, and it has 3 dimensions: x, y, and time. The following is my code ------------------------------------------------------------------------------------------------------------------------- nx <- 349 ny <- 277 nt <- 312 nRunning <- 12 missing <- -900. datain <- readBin("PWAT-mon.197901-200412.dat",what=numeric(),n=nx*ny*nt,size=4,endian="little") datain[datain<missing] <- NA data <- array(datain,c(nx,ny,nt)) library(clim.pact) eof.c <- EOF(data,mon=1) -------------------------------------------------------------------------------------------------------------------------- Then I get the error message as follow (origionally in Chinese): ------------------------------------------------------------------------------------------------------------------------ erro when there is a missing value at "if((class(fields)[2] != "monthly.field.object") & (class(fields[2] != :" ------------------------------------------------------------------------------------------------------------------------ So, I tried ---------------------------------------------------------------------------------------------------------------------------- t1 <- data[1:nx,1:ny,1] class(t1) <- c("field") EOF(t1,mon=NULL) --------------------------------------------------------------------------------------------------------------------------- It still didn't work. The error message is now (origionally in Chinese) ------------------------------------------------------------------------------------------------------ [1] "The directory data/ does not exists.. Creates it.." error at: rep.default(NA, dims[2]) : the second argument of rep() not correct besides: Warning messages: 1: 'data' already exists 2: force the left side of the function to become an array -------------------------------------------------------------------------------------------------- Can anybody help me with this? I am new to R, and I don't have a book with me. Thank you for your time. Best Regards, Jih-Wang (Aaron) Wang [[alternative HTML version deleted]]