How to create sequence of constant time interval
Try this (and see R News 4/1 for more).
library(chron) tt <- times(0:47/48) tt
[1] 00:00:00 00:30:00 01:00:00 01:30:00 02:00:00 02:30:00 03:00:00 03:30:00 04:00:00 04:30:00 05:00:00 05:30:00 06:00:00 06:30:00 07:00:00 07:30:00 [17] 08:00:00 08:30:00 09:00:00 09:30:00 10:00:00 10:30:00 11:00:00 11:30:00 12:00:00 12:30:00 13:00:00 13:30:00 14:00:00 14:30:00 15:00:00 15:30:00 [33] 16:00:00 16:30:00 17:00:00 17:30:00 18:00:00 18:30:00 19:00:00 19:30:00 20:00:00 20:30:00 21:00:00 21:30:00 22:00:00 22:30:00 23:00:00 23:30:00
chron(rep("1/1/09", length = length(tt)), tt)
[1] (01/01/09 00:00:00) (01/01/09 00:30:00) (01/01/09 01:00:00) (01/01/09 01:30:00) (01/01/09 02:00:00) (01/01/09 02:30:00) (01/01/09 03:00:00) [8] (01/01/09 03:30:00) (01/01/09 04:00:00) (01/01/09 04:30:00) (01/01/09 05:00:00) (01/01/09 05:30:00) (01/01/09 06:00:00) (01/01/09 06:30:00) [15] (01/01/09 07:00:00) (01/01/09 07:30:00) (01/01/09 08:00:00) (01/01/09 08:30:00) (01/01/09 09:00:00) (01/01/09 09:30:00) (01/01/09 10:00:00) [22] (01/01/09 10:30:00) (01/01/09 11:00:00) (01/01/09 11:30:00) (01/01/09 12:00:00) (01/01/09 12:30:00) (01/01/09 13:00:00) (01/01/09 13:30:00) [29] (01/01/09 14:00:00) (01/01/09 14:30:00) (01/01/09 15:00:00) (01/01/09 15:30:00) (01/01/09 16:00:00) (01/01/09 16:30:00) (01/01/09 17:00:00) [36] (01/01/09 17:30:00) (01/01/09 18:00:00) (01/01/09 18:30:00) (01/01/09 19:00:00) (01/01/09 19:30:00) (01/01/09 20:00:00) (01/01/09 20:30:00) [43] (01/01/09 21:00:00) (01/01/09 21:30:00) (01/01/09 22:00:00) (01/01/09 22:30:00) (01/01/09 23:00:00) (01/01/09 23:30:00)
On Mon, Feb 16, 2009 at 5:00 AM, Suresh_FSFM <suresh.ghalsasi at gmail.com> wrote:
Dear R-Experts, seek your help. There are two parts I want to deal with. 1) I want to create a time interval of say, 30 minutes starting from "00:00:00" hrs Thus at the end, I want to create sequence: 00:00:00 00:30:00 01:00:00 01:30:00 .. .. How to do so ? Later, I want to change the time-increment value in a variable and changing the value of this variable, I would like to create new sequence with that time increment. How to use "seq()" correctly? 2) I have a date stored in one variable. Say "2009-01-01" How can I combine this date with each time interval in the first part? Will concatenate work? so at the end, I would like to have: 2009-01-01 00:00:00 2009-01-01 00:30:00 2009-01-01 01:00:00 2009-01-01 01:30:00 ... ... Thank you in advance. -- View this message in context: http://www.nabble.com/How-to-create-sequence-of-constant-time-interval-tp22034441p22034441.html Sent from the R help mailing list archive at Nabble.com.
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