[R] How do I "teach" R that columns 1, 2, and 3 are the Year-Month-Day

Gregory Coats gregco@t@ @end|ng |rom me@com
Wed Jun 15 18:58:18 CEST 2022


I do not see any posting on this topic from Jeff Newmiller.
I seek a way to “teach” R that "2021-07-25” represents a Year, Month, and Day.
Greg Coats

> Fuel <- c(50.45, 61.48, 59.07, 55.40, 30.63, 41.35, 32.81, 49.86, 62.99, 89.37)
> plot (Fuel)
> Dates <- c("2021-07-25", "2021-08-27", "2021-09-26", "2021-11-04", "2021-11-22", "2021-11-26", "2021-12-06", "2022-01-14", "2022-04-29", "2022-06-11")
> plot (Dates)
Error in plot.window(...) : need finite 'ylim' values
In addition: Warning messages:
1: In xy.coords(x, y, xlabel, ylabel, log) : NAs introduced by coercion
2: In min(x) : no non-missing arguments to min; returning Inf
3: In max(x) : no non-missing arguments to max; returning -Inf

> xyplot (Dates, Fuel)
Error in xyplot(Dates, Fuel) : could not find function "xyplot"

> On Jun 15, 2022, at 6:02 AM, Martin Maechler <maechler using stat.math.ethz.ch> wrote:
> Jeff Newmiller's answer which was much shorter *and* only
> used base R  instead of an extra package


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