i have converted my data into date format like below:
day=as.Date(originaldate,%m/%d/%Y)
day[1:5]
[1] 2008-04-12 2011-07-02 2011-09-02 2008-04-12 2008-04-12
I wish to select only those observations from 2007 to 2009, how can I
select from this list?
[[alternative HTML version
I have a method which is not so smart --use grep to match the pattern.
for example:
dates - c(02/27/92, 02/27/92, 01/14/92, 02/28/92, 02/01/91)
day - as.Date(dates, %m/%d/%y)
day:
[1] 1992-02-27 1992-02-27 1992-01-14 1992-02-28 1991-02-01
If I want to search for 1991, I can use:
grep(1991-*, day)
On 04/07/2013 08:04, Dante.py wrote:
I have a method which is not so smart --use grep to match the pattern.
for example:
dates - c(02/27/92, 02/27/92, 01/14/92, 02/28/92, 02/01/91)
day - as.Date(dates, %m/%d/%y)
day:
[1] 1992-02-27 1992-02-27 1992-01-14 1992-02-28 1991-02-01
If I want to search
They are really good methods. Thank you very much.
Could I ask one more question. Is there obvious difference between these
two methods?
2013/7/4 Prof Brian Ripley rip...@stats.ox.ac.uk
On 04/07/2013 08:04, Dante.py wrote:
I have a method which is not so smart --use grep to match the
On 04/07/2013 11:36, Dante.py wrote:
They are really good methods. Thank you very much.
Could I ask one more question. Is there obvious difference between these
two methods?
Yes. It is obvious that the type of x differs.
2013/7/4 Prof Brian Ripley rip...@stats.ox.ac.uk
(chron)
yr1-month.day.year(unclass(day))$year
day[yr1=2007 yr1=2009]
#[1] 2008-04-12 2008-04-12 2008-04-12
A.K.
- Original Message -
From: Gallon Li gallon...@gmail.com
To: r-help r-h...@stat.math.ethz.ch
Cc:
Sent: Thursday, July 4, 2013 2:31 AM
Subject: [R] how to choose dates data?
i
of Anthropology
Texas AM University
College Station, TX 77840-4352
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of arun
Sent: Thursday, July 4, 2013 9:29 AM
To: Gallon Li
Cc: R help
Subject: Re: [R] how to choose dates data?
Hi,
You could
7 matches
Mail list logo
