The trick may be behind not reading the files properly is that all my 365 files donot have the same name. for example: files from number 1 to number9 are named for the first month: SWdown_200101_01.img SWdown_200101_09.img
files from number 10 to number30 are named: SWdown_200101_10.img SWdown_200101_30.img And so on for the second month: files from number 1 to number9 are named: SWdown_200102_01.img SWdown_200102_09.img files from number 10 to number30 are named: SWdown_200102_10.img SWdown_200102_30.img and in my code I just set the dierctory: dir1<- list.files("C:\\Users\\aalyaari\\Desktop\\New folder (11)\\", "*.img", full.names = TRUE). assuming that R would read files in order.But I do not really know if this right or I shall specify the names. X<-(82:85) ; Y<-(364:367) ##### for sellected region extract <- double() dir1<- list.files("C:\\Users\\aalyaari\\Desktop\\New folder (11)\\", "*.bin", full.names = TRUE) for (i in 1:365) { conne <- file(dir1[i], "rb") file1<- readBin(conne, numeric(),size=4, n=360*720, endian="little") file2<-matrix(data=file1,ncol=720,nrow=360) extract[i]<-mean(file2[X,Y],na.rm=TRUE) close(conne) } write.table(as.double(extract),"C:\\Users\\aalyaari\\Desktop\\New folder (10)\\new6.txt") -- View this message in context: http://r.789695.n4.nabble.com/R-does-not-recognise-columns-and-rows-as-they-are-supposed-to-be-tp4631217p4631352.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.