[R] Dates in Common

r at quantide.com
Fri, 23 Jan 2009 15:08:42 -0000

The problem is in the intersect function that does x = as.vector(x) and
therefore transforms date vector into a numeric .
Try to:
 d1 = as.character(data1) ; d2 = as.character(data2)
 d = intersect(d1, d2)
 data = as.Date(d)

A.


Tom La Bone 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
>