Re: [R] Print date on y axis with month, day, and year

[Rui Barradas]

Às 00:58 de 10/05/2024, Sorkin, John escreveu:
I am trying to use ggplot to plot the data, and R code, below. The dates 
(jdate) are printing as Mar 01, Mar 15, etc. I want to have the date printed as 
MMM DD YYYY (or any other way that will show month, date, and year, e.g. 
mm/dd/yy). How can I accomplish this?
yyy  <- structure(list(
   jdate = structure(c(19052, 19053, 19054, 19055,
                       19058, 19059, 19060, 19061, 19062, 19063, 19065, 19066, 
19067,
                       19068, 19069, 19072, 19073, 19074, 19075, 19076, 19077, 
19083,
                       19086, 19087, 19088, 19089, 19090, 19093, 19094, 19095), class = 
"Date"),
     Sum = c ( 1,  3,  9, 11, 13, 16, 18, 22, 26, 27, 30, 32, 35, 39,  41,
              43, 48, 51, 56, 58, 59, 63, 73, 79, 81, 88, 91, 93, 96, 103)),
     row.names = c(NA, 30L), class = "data.frame")
yyy
class(yyy$jdate)
ggplot(data=yyy[1:30,],aes(as.Date(jdate,format="%m-%d-%Y"),Sum)) +geom_point()


Thank you
John



John David Sorkin M.D., Ph.D.
Professor of Medicine, University of Maryland School of Medicine;
Associate Director for Biostatistics and Informatics, Baltimore VA Medical 
Center Geriatrics Research, Education, and Clinical Center;
PI Biostatistics and Informatics Core, University of Maryland School of 
Medicine Claude D. Pepper Older Americans Independence Center;
Senior Statistician University of Maryland Center for Vascular Research;

Division of Gerontology and Paliative Care,
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
Cell phone 443-418-5382



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Hello,

Since class(yyy$jdate) returns "Date", you have a real date and 
scale_x_date can handle the printed formats, there is no need for an 
extra as.Date in aes(). And get rid of the format = "%m-%d-%Y" argument.

Let scale_x_date take care of formating the date as you want it 
displayed. Any of the two below is a valid date format.



ggplot(data = yyy[1:30,], aes(jdate, Sum)) +
   geom_point() +
   # scale_x_date(date_labels = "%b %d, %Y")
   scale_x_date(date_labels = "%m/%d/%Y")



Hope this helps,

Rui Barradas



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