Hi Christine If somethings go wrong: 1 first check your data
str(Raw) 'data.frame': 10 obs. of 5 variables: $ Date : Factor w/ 16 levels "1/10","1/11",..: 6 7 2 4 12 9 7 2 4 12 $ Year : int 2002 2002 2002 2002 2002 2002 2002 2002 2002 2002 $ Station: Factor w/ 4 levels "E","F","H","I": 1 1 1 1 1 2 2 2 2 2 $ Abun : num 3.42 1.33 3.67 3.67 3.92 2.17 2.5 1.67 6.33 0.67 $ Date1 : Date, format: "2015-09-19" "2015-10-02" "2015-11-01" "2015-11-12" ... Raw$Date2 <- as.character(Raw$Date1) Raw$Date2 [1] "2015-09-19" "2015-10-02" "2015-11-01" "2015-11-12" "2015-11-29" "2015-09-20" "2015-10-02" "2015-11-01" "2015-11-12" "2015-11-29" Raw$Date2 <- as.Date(Raw$Date2, "%Y-%m-%d") 2 read the help guide again if not done recently ?lattice::xyplot or ?xyplot 3 start with a minimum number of arguments xyplot(Abun~Date2|as.factor(Year), Raw) or xyplot(Abun~Date2, Raw) if you are still having problems Dates are hard work in any language as they are not consistent so: a. use default b. use your own This works xyplot(Abun~Date2|as.factor(Year), Raw, par.settings = list(stripbackground = "transparent"), # background colour controlled here type="p", scales = list(x = list(at = sort(c(seq(as.Date(Raw$Date2[1]-4), by = "months", length = 4), seq(as.Date(Raw$Date2[1]+12), by = "months", length = 3))), labels = format(sort(c(seq(as.Date(Raw$Date2[1]-4), by = "months", length = 4), seq(as.Date(Raw$Date2[1]+12), by = "months", length = 3))), "%m-%d") ) ), xlab=list("Month",cex=1.5), ylab=list("Abundance",cex=1.5), cex=2, pch=c(16,16,21), col=c("Black","Grey","Black") ) par.settings is confining the parameters set by trellis.par.set() to the function to get them names(trellis.par.get() ) and going further trellis.par.get()$superpose.symbol will give you the values for superpose.symbol Beware: Do not make the labels etc so big that the axis labels are hard to read. Think of final size Regards Duncan Duncan Mackay Department of Agronomy and Soil Science University of New England Armidale NSW 2351 Email: home: mac...@northnet.com.au -----Original Message----- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Christine Lee via R-help Sent: Tuesday, 18 August 2015 14:16 To: r-help@r-project.org Subject: [R] date format in xyplot To whom it may concern, I have tried to plot some numbers against time with the time on the X-axis shown as "Jan", "Feb", etc. I used the following commands: Raw<-structure(list(Date = structure(c(6L, 7L, 2L, 4L, 12L, 9L, 7L, 2L, 4L, 12L), .Label = c("1/10", "1/11", "11/11", "12/11", "13/10", "19/9", "2/10", "2/11", "20/9", "26/11", "29/10", "29/11", "30/11", "31/10", "4/10", "6/10"), class = "factor"), Year = c(2002L, 2002L, 2002L, 2002L, 2002L, 2002L, 2002L, 2002L, 2002L, 2002L ), Station = structure(c(1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L), .Label = c("E", "F", "H", "I"), class = "factor"), Abun = c(3.42, 1.33, 3.67, 3.67, 3.92, 2.17, 2.5, 1.67, 6.33, 0.67), Date1 = structure(c(16697, 16710, 16740, 16751, 16768, 16698, 16710, 16740, 16751, 16768 ), class = "Date")), .Names = c("Date", "Year", "Station", "Abun", "Date1"), row.names = c(NA, 10L), class = "data.frame") Raw$Date1<-as.Date(Raw$Date,"%d/%m") xyplot(Abun~Date1|as.factor(Year),Raw,type="p",xlab=list("Month",cex=1.5),yl ab=list("Abundance",cex=1.5),cex=2,pch=c(16,16,21),col=c("Black","Grey","Bla ck"),strip=strip.custom(bg='white'),format="%B-%d") The date format shown on X-axis was just "10-1", "10-15" I should be grateful if any one could help indicating what has gone wrong? Regards, Christine ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.