If I take the following simple data: YEAR MONTH DAY WEIGHT.KG 2003 10 6 1.2 2003 10 12 1.2 2003 10 16 1.3
and format the date data and plot it: dates <- strptime(paste(DAY,MONTH,YEAR),"%d%m%Y") plot(c(min(dates),max(dates)),c(0,max(WEIGHT.KG)), xlab="Date",ylab="Weight (kg)",type="n") lines(dates,WEIGHT.KG) points(dates,WEIGHT.KG) I find that the data points are all plotted at (x-1,y), where x is in days. Have I requested this behaviour accidentally? I'm using R-1.8 on OS X. Printing the dates object looks correct, and simple manipulations such as max(dates)-min(dates) behave normally. Jacob Etches Doctoral candidate Dept of Public Health Sciences University of Toronto
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