Hi Jim, Thank you VERY much! In what I tried, my values for the vertical Y were automatically understood by R. But it appears that the string yyyy-mm-dd was NOT recognized by R as a date for the X axis, and gave a red error message. My values for Year-Month-Day were NOT understood by R. Is there a convenient way to tell R to interpret “2020-12-13” as a date?
data <- data.frame( day = as.Date("2020-02-15", "2020-03-10", "2020-05-04", "2020-06-21", "2020-08-01", "2020-08-27", "2020-09-28", "2020-11-09", "2020-12-11") value = (15.973, 18.832, 17.392, 14.774, 19.248, 14.913, 15.226, 14.338, 18.777, 19.652)) p <- ggplot(data, aes(x=day, y=value)) geom_line() xlab("X Label") p Error: unexpected symbol in: " day = as.Date("2020-02-15", "2020-03-10", "2020-05-04", "2020-06-21", "2020-08-01", "2020-08-27", "2020-09-28", "2020-11-09", "2020-12-11") value" Greg Coats gregco...@me.com Reston, Virginia USA > On Dec 13, 2020, at 5:42 PM, Jim Lemon <drjimle...@gmail.com> wrote: > > Hi Gregory, > Here's a start: > > gcdf<-read.table(text="2020-01-05 15.973 > 2020-02-15 18.832 > 2020-03-10 17.392 > 2020-05-04 14.774 > 2020-06-21 19.248 > 2020-08-01 14.913 > 2020-08-27 15.226 > 2020-09-28 14.338 > 2020-11-09 18.777 > 2020-12-11 19.652", > header=TRUE,stringsAsFactors=FALSE, > col.names=c("date","gallons")) > gcdf$date<-as.Date(gcdf$date,"%Y-%m-%d") > plot(gcdf$date,gcdf$gallons,main="Gallons by date", > xlab="Date",ylab="Gallons") > > Jim > > On Mon, Dec 14, 2020 at 9:33 AM Gregory Coats via R-help > <r-help@r-project.org> wrote: >> >> Starting with year-month-day, for the variable gallons, I can easily plot >> the variable gallons, while disregarding the date. >> gallons <- c (15.973, 18.832, 17.392, 14.774, 19.248, 14.913, 15.226, >> 14.338, 18.777, 19.652) >> plot (gallons, type="l", xlab="X label", ylab="Y label", col="blue”) >> >> How do I direct R to plot the variable gallons, at the appropriate, >> irregularly-spaced places on the X axis, while paying attention to the >> year-month-day? >> >> format = "%Y-%m-%d” >> 2020-01-05 15.973 >> 2020-02-15 18.832 >> 2020-03-10 17.392 >> 2020-05-04 14.774 >> 2020-06-21 19.248 >> 2020-08-01 14.913 >> 2020-08-27 15.226 >> 2020-09-28 14.338 >> 2020-11-09 18.777 >> 2020-12-11 19.652 >> [[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. [[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.