Dear all, I have a problem which I'm not to fix. I have the following two series:
a=structure(c(33242.5196150509, 34905.8434338503, 38490.6957848689, 38747.0287172129, 38919.1028597142, 39026.3956586941, 38705.5344288997, 38545.6274379387, 38651.2079354205, 38748.2769580121), index = structure(c(14029, 14032, 14033, 14034, 14035, 14036, 14039, 14040, 14041, 14042 ), class = "Date"), class = "zoo") b=structure(c(53337.7643740991, 52210.2079727035, 50235.4480363949, 50667.1147389469, 50796.5403152116, 51113.5420947436, 51003.3603311344, 50654.0539778796, 49927.5267060329, 49320.1813921822), index = structure(c(14029, 14032, 14033, 14034, 14035, 14036, 14039, 14040, 14041, 14042 ), class = "Date"), class = "zoo") I want to plot them on the same chart, with the x-axis the Date, and the y-axis the time in format %H:%M. At the moment, the y series is expressed in seconds from midnight. I am confused with the as.POSIXct conversion. > hours(min(rollrep)) [1] 9 > minutes(min(rollrep)) [1] 34 > seconds(min(rollrep)) [1] 27 however, by doing the following it seems the minimum time is 11:09, which is not true. as.POSIXct(round(min(rollrep)),origin=Sys.Date()) [1] "2013-08-09 11:09:14 CEST" Do you have any advice? Is there a way to plot only the hours and minutes, without having to go to the Sys.Date? Thank you, Marco -- View this message in context: http://r.789695.n4.nabble.com/Plotting-zoo-objects-with-chron-axis-tp4673412.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.