One hour increment in R, zoo
How can I add one hour to all the elements of the index of a zoo series?
I've tried
newseries <- myzooseries
index(newseries) <- index(myzooseries)+time开发者_如何学JAVAs("1:00:00")
but I get the message
Incompatible methods ("Ops.dates", "Ops.times") for "+"
thanks
My index is a chron object with date and time but I've tried with simpler examples and I can't get it
This is easily solved by adding the time you want in a numerical fashion :
newseries <- myzooseries
index(newseries) <- index(myzooseries) + 1/24
chron objects are represented as decimal numbers, so you can use that to calculate. A day is 1, so an hour is 1/24, a minute 1/1440 and so on. You can see this easily if you use the function times. This gives you the times of the object tested, eg :
> A <- chron(c("01/01/97","01/02/97","01/03/97"))
> B <- A + 1/24
> B
[1] (01/01/97 01:00:00) (01/02/97 01:00:00) (01/03/97 01:00:00)
> times(A)
Time in days:
[1] 9862 9863 9864
> times(B)
Time in days:
[1] 9862.042 9863.042 9864.042
> times(B-A)
[1] 01:00:00 01:00:00 01:00:00
> times(A[3]-B[1])
Time in days:
[1] 1.958333
Convert to POSIXct
, add 60*60 (1h in s) and then convert back.
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