So maybe i will finaly succeed asking the right way,
Hy all, I'm plotting graphs using plot() function, they are on X axes POSIX dates: "POSIXt" "oldClass" "POSIXct" "POSIXlt" I can't figure out why sometimes it prints the month and days and sometimes it prints the unix timestamps. Here is an example that reproduce my problem the data's to use with it can be downloaded from http://www.alliance-ir.net/r-project/demo.tar.gz <http://www.alliance-ir.net/r-project/demo.tar.gz> : limite_x<-structure(as.numeric(read.table("limite_x")), class=c("POSIXt","POSIXct")) limite_y<-as.numeric(read.table("limite_y")) test<-as.numeric(read.table("y_values")) abscisse_test<-structure(as.numeric(read.table("x_values")), class=c("POSIXt","POSIXct")) plot((test/10)~abscisse_test,type="s",col="lightgreen",xlab="",ylab="",ylim=limite_y,xlim=limite_x) length_test<-length(test) #if i cut the var "test" to be closer to xlim values, i know that xlim is at the end of "test" : test_short<-test[(length_test-10):length_test] abscisse_test_short<-abscisse_test[(length_test-10):length_test] plot((test_short/10)~abscisse_test_short,type="s",col="lightgreen",xlab="",ylab="",ylim=limite_y,xlim=limite_x) dev.off() > sessionInfo() R version 2.4.0 (2006-10-03) i386-pc-linux-gnu locale: [EMAIL PROTECTED];LC_NUMERIC=C;[EMAIL PROTECTED];[EMAIL PROTECTED];[EMAIL PROTECTED];[EMAIL PROTECTED];[EMAIL PROTECTED];LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;[EMAIL PROTECTED];LC_IDENTIFICATION=C attached base packages: [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" [7] "base" COMTE Guillaume Ingénieur Projet Alliance Technologies Projet Philharmonie 24 rue Martre 92110 Clichy Tel : 01 40 87 48 06 Fax : 01 40 87 48 14 [[alternative HTML version deleted]]
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