[R] Dates in Common

Whit Armstrong
Fri, 23 Jan 2009 14:30:33 -0000

you want:
ans <- intersect(data1,data2)
class(ans) <- c("POSIXt","POSIXct")

I personally think intersect should preserve the class of the object
(if both args have the same class), but I think r-core has a different
opinion.

-Whit


On Fri, Jan 23, 2009 at 9:02 AM, Tom La Bone <booboo at gforcecable.com>
wrote:
>
> I have two collections of dates and I want to figure out what dates they
have
> in common. This is not giving me what I want (I don't know what it is
giving
> me). What is the best way to do this?
>
> Tom
>
>> data1
>  [1] "1948-02-24 EST" "1949-04-12 EST" "1950-05-29
EDT" "1951-05-21 EDT"
>  [5] "1951-12-20 EST" "1953-01-22 EST" "1955-02-28
EST" "1956-03-08 EST"
>  [9] "1957-03-22 EST" "1958-02-07 EST"
>> data2
>  [1] "1948-02-24 EST" "1949-04-12 EST" "1950-05-29
EDT" "1951-05-21 EDT"
>  [5] "1951-12-20 EST" "1953-01-22 EST" "1955-02-28
EST" "1956-03-08 EST"
>  [9] "1957-03-22 EST" "1958-02-07 EST"
>> intersect(data1,data2)
>  [1] -689626800 -653943600 -618350400 -587505600 -569098800 -534625200
>  [7] -468356400 -436042800 -403297200 -375476400
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