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 (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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