[R] Adding Year-Month-Day to X axis

[Jim Lemon]

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 <gregcoats using 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]]
>
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