[R] How to specify year-month-day for a plot

Jim Lemon
2020-12-13T22:42:11Z

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 at 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]]
>
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