Message-ID: <22369479.post@talk.nabble.com>
Date: 2009-03-06T11:17:01Z
From: Bart Joosen
Subject: Extract dates from dataframe
Hi,
I have the following dataframe:
ID Dates
1 16-07-01 06-10-95
2 24/01/02 06-10-95
3 16/01/02 16/08/94 12/01/91
And I would like to extract the dates, but couple the ID's to the right
dates, eg:
ID Dates
1 16-07-01
1 06-10-95
2 24-01-02
2 ....
I have no clue about how to get started, looks something for the
regexp/grep/... kind of functions, but I don't get the point.
Any thoughts??
Kind regards
Bart Joosen
PS: for the reconstruction of the dataframe:
dat <-
structure(list(ID = c(1, 2, 3), Dates = structure(c(2L, 4L, 6L
), .Label = c("16-01-02 16-08-94", "16-07-01 06-10-95", "24-01-02
06-10-95",
"24/01/02 06-10-95", "16/01/02 16/08/94", "16/01/02 16/08/94
12/01/91"
), class = "factor")), .Names = c("ID", "Dates"), row.names = c(NA,
3L), class = "data.frame")
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