On Dec 8, 2012, at 1:34 PM, CHEN, Cheng wrote:
Hi, guys
I don't understand why I can apply as.Date to a single item in the
list:
as.Date(alldays[4])
[1] "29-03-20"
but when I try to lapply as.Date to all the items, i got a sequence
of neg
numbers:
sapply(alldays[1:4], FUN=as.Date)
03-04-2012 02-04-2012 30-03-2012 29-03-2012
-718323 -718688 -708492 -708857
does anyone know what's wrong here?
Problem #1
`sapply` will coerce to matrix or vector and remove the Date class
Problem #2:
You are not supplying a format to as.Date and your dates are not in
the default formats>
> sapply(dts, as.Date)
03-04-2012 02-04-2012 30-03-2012 29-03-2012
-718323 -718688 -708492 -708857
> sapply(dts, as.Date, format="%d-%m-%Y")
03-04-2012 02-04-2012 30-03-2012 29-03-2012
15433 15432 15429 15428
> lapply(dts, as.Date, format="%d-%m-%Y")
[[1]]
[1] "2012-04-03"
[[2]]
[1] "2012-04-02"
[[3]]
[1] "2012-03-30"
[[4]]
[1] "2012-03-29"
i am very confused!
Thanks a lot for your time in such a freezing weekend!
Problem #3:
You need to move to the California Coast.
--
.
David Winsemius, MD
Alameda, CA, USA
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