Hello,
There are two or three simple ways.
x <- c("2012-08-09 22:23:00", "2012-08-09 22:24:00")
#1st: dates without times
as.Date(x)
[1] "2012-08-09" "2012-08-09"
#2nd: dates and times and time zones.
# Too big for axis tick marks?
as.POSIXct(x)
[1] "2012-08-09 22:23:00 BST" "2012-08-09 22:24:00 BST"
#3rd: using ?format.POSIXct you can do whatever you want.
y <- as.POSIXct(x)
format(y, format = "%m/%Y")
format(y, format = "%b/%Y")
Hope this helps.
Rui Barradas
Em 12-08-2012 06:33, Erin Hodgess escreveu:
Dear R People:
I have a column in a data frame that has date and time (one per
minute), such as "2012-08-09 22:23:00 2012-08-09 22:24:00" etc.
What is the best way to change that into numeric dates to be used as
an x-axis, please?
I've been looking at as.Date and as.Date.numeric, but those are for
monthly/yearly data.
Thanks for any help in advance!
Sincerely,
Erin
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