Hi Greg, What you are getting there is a factor, interpreted as a 1:n sequence based on the sort order of your "dates". Here's a way to get dates on your x-axis in the format you want:
x_yyyymmdd<-as.Date(c("2018-04-25","2018-04-26","2018-04-27", "2018-04-28","2018-04-29","2018-04-30","2018-05-01","2018-05-02", "2018-05-03","2018-05-04","2018-05-05"),format="%Y-%m-%d") plot(x_yyyymmdd, y_duration, type="l",xaxt="n") library(plotrix) staxlab(1,at=x_yyyymmdd,labels=format(x_yyyymmdd,"%Y-%m-%d")) Jim On Sun, May 6, 2018 at 4:14 AM, Gregory Coats <gregco...@me.com> wrote: > I am using R 3.5.0 for Mac OS X. > Issuing these two commands yields the expected plot. > y_duration <- c (301.59050, 387.35700, 365.64366, 317.26150, 321.71883, > 342.44950, 318.95350, 322.33233, 330.60333, 428.99516, 297.82066) > plot (y_duration, type="l”) > > Adding Year-Month-Day values for the x axis, and then calling plot (x,y), > yields a bizarre plot. Apparently, R does not understand my Year-Month-Day > values. > x_yyyymmdd <- c (2018-04-25, 2018-04-26, 2018-04-27, 2018-04-28, 2018-04-29, > 2018-04-30, 2018-05-01, 2018-05-02, 2018-05-03, 2018-05-04, 2018-05-05) > plot (x_yyyymmdd, y_duration, type="l") > > I would be enormously appreciative of your guidance. > Greg Coats > Virginia, USA > [[alternative HTML version deleted]] > > ______________________________________________ > 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.