[R] noob requesting help

Rui Barradas ruipbarradas at sapo.pt
Wed Jun 13 18:16:43 CEST 2012


Hello,

Sorry, but the output of dput() starts with 'structure', not like what 
you've posted.
And there are much more than 20 dates in the beginning.
Anyway I believe we can say something about what's going on. Later.

The posting guide is easy to find, all mails from r-help end with

R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.


As for the problem, this partial output of dput shows that your dates 
are factors. Check it with str(long).
If so, when you read the data from file use the option

read.table(...etc... , stringsAsFactors=FALSE) # or read.csv

See what happens and say something.

Rui Barradas

Em 13-06-2012 14:11, capital_P escreveu:
> Rui Barradas wrote
>>
>> Also, you should follow the posting guide and post a data example using
>> dput(). Like this:
>>
>> dput(head(dat, 20))  # or 30, see ?head
>>
>> Then copy the output of that instruction and paste it in your post.
>>
>
> I can't find the posting guide	
>
>
>> dput(head(long, 20))		
>
>      "2011-07-21 04:58:22", "2011-07-21 05:00:38", "2011-07-21 05:01:17",
>      "2011-07-21 05:03:08", "2011-07-21 05:05:42", "2011-07-21 05:07:55",
>      "2011-07-21 05:10:46", "2011-07-21 05:11:24", "2011-07-21 05:12:44",
>      "2011-07-21 05:15:49", "2011-07-21 05:17:31", "2011-07-21 05:20:51",
>      "2011-07-21 05:24:43", "2011-07-21 05:26:10", "2011-07-21 05:31:05",
>      "2011-07-21 05:35:04", "2011-07-21 05:35:53", "2011-07-21 05:39:47",
>      "2011-07-21 05:40:41", "2011-07-21 05:44:45", "2011-07-21 05:45:30",
>      "2011-07-21 05:45:51", "2011-07-21 05:49:30", "2011-07-21 05:50:18",
>      "2011-07-21 05:54:19", "2011-07-21 05:55:06", "2011-07-21 05:55:52",
>      "2011-07-21 05:59:07", "2011-07-21 05:59:53", "2011-07-21 06:03:55",
>      "2011-07-21 06:04:41", "2011-07-21 06:06:11", "2011-07-21 06:08:44",
>      "2011-07-21 06:09:30", "2011-07-21 06:14:17", "2011-07-21 06:16:32",
>      "2011-07-21 06:19:05", "2011-07-21 06:23:56", "2011-07-21 06:26:57",
>      "2011-07-21 06:28:44", "2011-07-21 06:30:52", "2011-07-21 06:33:32",
>      "2011-07-21 06:37:07", "2011-07-21 06:38:18", "2011-07-21 06:43:06",
>      "2011-07-21 06:47:13", "2011-07-21 06:47:55", "2011-07-21 06:52:47",
>      "2011-07-21 06:53:12", "2011-07-21 06:57:30", "2011-07-21 06:57:34",
>      "2011-07-21 07:02:18", "2011-07-21 07:07:18", "2011-07-21 07:07:51",
>      "2011-07-21 07:12:10", "2011-07-21 07:13:36", "2011-07-21 07:16:58",
>      "2011-07-21 07:18:13", "2011-07-21 07:18:21", "2011-07-21 07:21:47",
>      "2011-07-21 07:23:39", "2011-07-21 07:26:46", "2011-07-21 07:28:27",
>      "2011-07-21 07:29:11", "2011-07-21 07:31:49", "2011-07-21 07:33:18",
>      "2011-07-21 07:36:51", "2011-07-21 07:38:14", "2011-07-21 07:39:34",
>      "2011-07-21 07:41:55", "2011-07-21 07:43:08", "2011-07-21 07:47:00",
>      "2011-07-21 07:47:57", "2011-07-21 07:50:08", "2011-07-21 07:52:04",
>      "2011-07-21 07:52:42", "2011-07-21 07:57:09", "2011-07-21 07:57:34",
>      "2011-07-21 08:00:28", "2011-07-21 08:02:20", "2011-07-21 08:02:33",
>      "2011-07-21 08:07:10", "2011-07-21 08:07:21", "2011-07-21 08:10:48",
>      "2011-07-21 08:11:57", "2011-07-21 08:12:12", "2011-07-21 08:16:50",
>      "2011-07-21 08:16:59", "2011-07-21 08:21:08", "2011-07-21 08:21:46",
>      "2011-07-21 08:21:51", "2011-07-21 08:26:34", "2011-07-21 08:26:37",
>      "2011-07-21 08:31:22", "2011-07-21 08:31:24", "2011-07-21 08:31:36",
>      "2011-07-21 08:36:10", "2011-07-21 08:36:17", "2011-07-21 08:40:57",
>      "2011-07-21 08:41:10", "2011-07-21 08:42:03", "2011-07-21 08:45:47",
>      "2011-07-21 08:46:08", "2011-07-21 08:50:35", "2011-07-21 08:50:55",
>      "2011-07-21 08:52:16", "2011-07-21 08:55:21", "2011-07-21 08:55:44",
>      "2011-07-21 09:00:10", "2011-07-21 09:00:29", "2011-07-21 09:02:28",
>      "2011-07-21 09:04:57", "2011-07-21 09:05:17", "2011-07-21 09:09:48",
>      "2011-07-21 09:10:04", "2011-07-21 09:12:45", "2011-07-21 09:14:33",
>      "2011-07-21 09:14:52", "2011-07-21 09:19:22", "2011-07-21 09:20:09",
>      "2011-07-21 09:22:59", "2011-07-21 09:24:09", "2011-07-21 09:24:59",
>      "2011-07-21 09:28:57", "2011-07-21 09:29:48", "2011-07-21 09:33:07",
>      "2011-07-21 09:33:45", "2011-07-21 09:34:38", "2011-07-21 09:38:35",
>      "2011-07-21 09:39:24", "2011-07-21 09:43:15", "2011-07-21 09:43:21",
>      "2011-07-21 09:44:12", "2011-07-21 09:48:10", "2011-07-21 09:49:00",
>      "2011-07-21 09:53:24", "2011-07-21 09:53:42", "2011-07-21 09:53:48",
>      "2011-07-21 09:58:28", "2011-07-21 09:58:36", "2011-07-21 10:03:24",
>      "2011-07-21 10:03:32", "2011-07-21 10:04:12", "2011-07-21 10:08:12",
>      "2011-07-21 10:08:35", "2011-07-21 10:13:15", "2011-07-21 10:13:40",
>      "2011-07-21 10:14:19", "2011-07-21 10:18:03", "2011-07-21 10:18:34",
>      "2011-07-21 10:22:55", "2011-07-21 10:23:22", "2011-07-21 10:24:38",
>      "2011-07-21 10:27:39", "2011-07-21 10:28:09", "2011-07-21 10:32:27",
>      "2011-07-21 10:32:57", "2011-07-21 10:36:04", "2011-07-21 10:37:26",
>      "2011-07-21 10:37:46", "2011-07-21 10:42:30", "2011-07-21 10:42:33",
>      "2011-07-21 10:46:16", "2011-07-21 10:47:22", "2011-07-21 10:47:35",
>      "2011-07-21 10:52:11", "2011-07-21 10:52:57", "2011-07-21 10:56:32",
>      "2011-07-21 10:57:02", "2011-07-21 10:57:48", "2011-07-21 11:01:51",
>      "2011-07-21 11:02:35", "2011-07-21 11:06:34", "2011-07-21 11:06:43",
>      "2011-07-21 11:07:27", "2011-07-21 11:12:16", "2011-07-21 11:14:01",
>      "2011-07-21 11:17:04", "2011-07-21 11:17:06", "2011-07-21 11:21:59",
>      "2011-07-21 11:27:03", "2011-07-21 11:27:44", "2011-07-21 11:32:07",
>      "2011-07-21 11:37:32", "2011-07-21 11:37:56", "2011-07-21 11:42:18",
>      "2011-07-21 11:43:58", "2011-07-21 11:47:07", "2011-07-21 11:48:05",
>      "2011-07-21 11:51:54", "2011-07-21 11:56:42", "2011-07-21 11:58:14",
>      "2011-07-21 12:01:30", "2011-07-21 12:04:44", "2011-07-21 12:06:20",
>      "2011-07-21 12:09:29", "2011-07-21 12:09:31", "2011-07-21 12:11:07",
>      "2011-07-21 12:14:17", "2011-07-21 12:15:55", "2011-07-21 12:19:05",
>      "2011-07-21 12:20:01", "2011-07-21 12:20:43", "2011-07-21 12:23:54",
>      "2011-07-21 12:25:30", "2011-07-21 12:28:41", "2011-07-21 12:30:20",
>      "2011-07-21 12:30:28", "2011-07-21 12:33:30", "2011-07-21 12:35:08",
>      "2011-07-21 12:38:17", "2011-07-21 12:39:56", "2011-07-21 12:40:38",
>      "2011-07-21 12:43:05", "2011-07-21 12:44:45", "2011-07-21 12:47:53",
>      "2011-07-21 12:49:31", "2011-07-21 12:51:06", "2011-07-21 12:52:41",
>      "2011-07-21 12:54:39", "2011-07-21 12:57:29", "2011-07-21 12:59:33",
>      "2011-07-21 13:01:30", "2011-07-21 13:02:17", "2011-07-21 13:04:38",
>      "2011-07-21 13:07:06", "2011-07-21 13:09:43", "2011-07-21 13:11:46",
>      "2011-07-21 13:12:04", "2011-07-21 13:15:03", "2011-07-21 13:16:57",
>      "2011-07-21 13:20:05", "2011-07-21 13:21:56", "2011-07-21 13:22:06",
>      "2011-07-21 13:25:09", "2011-07-21 13:27:00", "2011-07-21 13:30:15",
>      "2011-07-21 13:32:04", "2011-07-21 13:32:26", "2011-07-21 13:35:18",
>      "2011-07-21 13:37:08", "2011-07-21 13:40:25", "2011-07-21 13:42:15",
>      "2011-07-21 13:42:53", "2011-07-21 13:45:25", "2011-07-21 13:47:17",
>      "2011-07-21 13:50:30", "2011-07-21 13:52:20", "2011-07-21 13:52:57",
>      "2011-07-21 13:55:34", "2011-07-21 13:57:26", "2011-07-21 14:01:01",
>      "2011-07-21 14:03:21", "2011-07-21 14:05:47", "2011-07-21 14:10:40",
>      "2011-07-21 14:13:41", "2011-07-21 14:23:50", "2011-07-21 14:34:23",
>      "2011-07-21 14:38:50", "2011-07-21 14:43:39", "2011-07-21 14:44:48",
>      "2011-07-21 14:48:28", "2011-07-21 14:53:14", "2011-07-21 14:55:21",
>      "2011-07-21 14:58:04", "2011-07-21 15:02:52", "2011-07-21 15:06:03",
>      "2011-07-21 15:07:40", "2011-07-21 15:12:28", "2011-07-21 15:16:39",
>      "2011-07-21 15:17:15", "2011-07-21 15:22:05", "2011-07-21 15:26:51",
>      "2011-07-21 15:27:10", "2011-07-21 15:28:51", "2011-07-21 15:31:40",
>      "2011-07-21 15:36:28", "2011-07-21 15:37:28", "2011-07-21 15:41:15",
>      "2011-07-21 15:46:04", "2011-07-21 15:47:51", "2011-07-21 15:49:00",
>      "2011-07-21 15:50:56", "2011-07-21 15:55:39", "2011-07-21 15:58:46",
>      "2011-07-21 16:00:28", "2011-07-21 16:05:20", "2011-07-21 16:09:27",
>      "2011-07-21 16:10:03", "2011-07-21 16:14:50", "2011-07-21 16:18:55",
>      "2011-07-21 16:19:39", "2011-07-21 16:20:04", "2011-07-21 16:24:28",
>      "2011-07-21 16:29:15", "2011-07-21 16:30:17", "2011-07-21 16:34:03",
>      "2011-07-21 16:38:53", "2011-07-21 16:40:34", "2011-07-21 16:43:59",
>      "2011-07-21 16:48:48", "2011-07-21 16:49:02", "2011-07-21 16:50:30",
>      "2011-07-21 16:54:03", "2011-07-21 16:58:50", "2011-07-21 17:00:54",
>      "2011-07-21 17:03:38", "2011-07-21 17:08:27", "2011-07-21 17:11:09",
>      "2011-07-21 17:13:15", "2011-07-21 17:18:02", "2011-07-21 17:18:49",
>      "2011-07-21 17:21:29", "2011-07-21 17:22:52", "2011-07-21 17:27:39",
>      "2011-07-21 17:32:26", "2011-07-21 17:37:14", "2011-07-21 17:42:03",
>      "2011-07-21 17:44:48", "2011-07-21 17:46:50", "2011-07-21 17:48:54",
>      "2011-07-21 17:51:38", "2011-07-21 17:55:06", "2011-07-21 17:56:26",
>      "2011-07-21 18:01:14", "2011-07-21 18:05:24", "2011-07-21 18:06:02",
>      "2011-07-21 18:10:54", "2011-07-21 18:15:25", "2011-07-21 18:15:41",
>      "2011-07-21 18:19:19", "2011-07-21 18:20:27", "2011-07-21 18:25:36",
>      "2011-07-21 18:25:41", "2011-07-21 18:30:20", "2011-07-21 18:35:13",
>      "2011-07-21 18:36:14", "2011-07-21 18:39:56", "2011-07-21 18:44:46",
>      "2011-07-21 18:47:16", "2011-07-21 18:49:30", "2011-07-21 18:49:33",
>      "2011-07-21 18:54:22", "2011-07-21 18:59:07", "2011-07-21 18:59:46",
>      "2011-07-21 19:04:00", "2011-07-21 19:08:56", "2011-07-21 19:09:46",
>      "2011-07-21 19:14:00", "2011-07-21 19:19:33", "2011-07-21 19:19:58",
>      "2011-07-21 19:20:11", "2011-07-21 19:30:46", "2011-07-21 19:40:53",
>      "2011-07-21 19:49:40", "2011-07-21 19:51:16", "2011-07-21 19:52:10",
>      "2011-07-21 20:01:47", "2011-07-21 20:12:43", "2011-07-21 20:19:38",
>      "2011-07-21 20:23:05", "2011-07-21 20:24:27", "2011-07-21 20:33:26",
>      "2011-07-21 20:44:06", "2011-07-21 20:49:29", "2011-07-21 20:54:26",
>      "2011-07-21 20:54:41", "2011-07-21 21:05:39", "2011-07-21 21:16:14",
>      "2011-07-21 21:20:10", "2011-07-21 21:24:55", "2011-07-21 21:26:31",
>      "2011-07-21 21:36:52", "2011-07-21 21:47:02", "2011-07-21 21:50:01",
>      "2011-07-21 21:55:10", "2011-07-21 21:57:08", "2011-07-21 22:07:17",
>      "2011-07-21 22:17:26", "2011-07-21 22:19:52", "2011-07-21 22:24:59",
>      "2011-07-21 22:27:53", "2011-07-21 22:38:16", "2011-07-21 22:49:12",
>      "2011-07-21 22:49:45", "2011-07-21 22:54:54", "2011-07-21 22:59:39",
>      "2011-07-21 23:10:00", "2011-07-21 23:19:38", "2011-07-21 23:20:24",
>      "2011-07-21 23:24:53", "2011-07-21 23:30:45", "2011-07-21 23:40:59",
>      "2011-07-21 23:49:29", "2011-07-21 23:51:12", "2011-07-21 23:55:08",
>      "2011-07-22 00:01:23", "2011-07-22 00:11:45", "2011-07-22 00:19:49",
>      "2011-07-22 00:21:58", "2011-07-22 00:25:10", "2011-07-22 00:32:06",
>      "2011-07-22 00:42:34", "2011-07-22 00:49:56", "2011-07-22 00:52:53",
>      "2011-07-22 00:55:34", "2011-07-22 01:03:15", "2011-07-22 01:13:23",
>      "2011-07-22 01:20:03", "2011-07-22 01:23:44", "2011-07-22 01:26:11",
>      "2011-07-22 01:33:57", "2011-07-22 01:43:55", "2011-07-22 01:50:07",
>      "2011-07-22 01:54:12", "2011-07-22 01:56:41", "2011-07-22 02:04:21",
>      "2011-07-22 02:14:32", "2011-07-22 02:20:11", "2011-07-22 02:24:52",
>      "2011-07-22 02:27:09", "2011-07-22 02:35:00", "2011-07-22 02:45:10",
>      "2011-07-22 02:50:02", "2011-07-22 02:55:18", "2011-07-22 03:05:22",
>      "2011-07-22 03:15:35", "2011-07-22 03:20:27", "2011-07-22 03:26:31",
>      "2011-07-22 03:26:55", "2011-07-22 03:37:59", "2011-07-22 03:48:20",
>      "2011-07-22 03:50:17", "2011-07-22 03:56:58", "2011-07-22 03:58:31",
>      "2011-07-22 04:09:12", "2011-07-22 04:19:33", "2011-07-22 04:20:09",
>      "2011-07-22 04:27:09", "2011-07-22 04:30:41", "2011-07-22 04:40:48",
>      "2011-07-22 04:50:01", "2011-07-22 04:51:16", "2011-07-22 04:57:03",
>      "2011-07-22 05:01:21", "2011-07-22 05:11:31", "2011-07-22 05:19:53",
>      "2011-07-22 05:21:40", "2011-07-22 05:26:59", "2011-07-22 05:32:01",
>      "2011-07-22 05:42:30", "2011-07-22 05:49:47", "2011-07-22 05:52:45",
>      "2011-07-22 05:57:16", "2011-07-22 06:05:39", "2011-07-22 06:15:58",
>      "2011-07-22 06:17:39", "2011-07-22 06:20:09", "2011-07-22 06:26:10",
>      "2011-07-22 06:36:31", "2011-07-22 06:37:48", "2011-07-22 06:47:14",
>      "2011-07-22 06:50:00", "2011-07-22 06:57:34", "2011-07-22 06:57:48",
>      "2011-07-22 07:07:50", "2011-07-22 07:18:06", "2011-07-22 07:18:11",
>      "2011-07-22 07:19:53", "2011-07-22 07:28:19", "2011-07-22 07:38:20",
>      "2011-07-22 07:38:25", "2011-07-22 07:39:53", "2011-07-22 07:48:35",
>      "2011-07-22 07:59:14", "2011-07-22 08:00:04", "2011-07-22 08:00:34",
>      "2011-07-22 08:09:23", "2011-07-22 08:19:35", "2011-07-22 08:20:40",
>      "2011-07-22 08:20:55", "2011-07-22 08:29:55", "2011-07-22 08:39:59",
>      "2011-07-22 08:40:40", "2011-07-22 08:41:14", "2011-07-22 08:50:27",
>      "2011-07-22 09:00:32", "2011-07-22 09:00:41", "2011-07-22 09:01:18",
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>      "2011-08-05 23:00:42", "2011-08-05 23:31:02", "2011-08-07 00:26:46",
>      "2011-08-07 00:56:56", "2011-08-07 01:27:19", "2011-08-07 01:57:31",
>      "2011-08-07 02:28:12", "2011-08-07 02:58:39", "2011-08-07 03:29:33",
>      "2011-08-07 03:59:55", "2011-08-07 04:30:13", "2011-08-07 05:00:32",
>      "2011-08-07 06:01:32", "2011-08-07 06:31:42", "2011-08-07 07:01:54",
>      "2011-08-07 07:32:17", "2011-08-07 08:02:44", "2011-08-07 08:32:58",
>      "2011-08-07 09:04:06", "2011-08-07 09:34:20", "2011-08-07 10:04:26",
>      "2011-08-07 10:34:51", "2011-08-07 11:05:13", "2011-08-07 11:36:04",
>      "2011-08-07 12:06:39", "2011-08-07 12:36:41", "2011-08-07 13:07:10",
>      "2011-08-07 14:11:33", "2011-08-07 14:41:43", "2011-08-07 15:12:15",
>      "2011-08-07 15:43:08", "2011-08-07 16:13:30", "2011-08-07 16:43:40",
>      "2011-08-07 17:15:54", "2011-08-07 18:17:15", "2011-08-07 18:47:21",
>      "2011-08-07 19:17:30", "2011-08-07 19:48:46", "2011-08-07 20:19:36",
>      "2011-08-07 20:50:06", "2011-08-07 21:21:17", "2011-08-07 21:52:05",
>      "2011-08-07 22:22:51", "2011-08-07 22:53:03", "2011-08-07 23:23:42",
>      "2011-08-07 23:53:47", "2011-08-08 00:23:55", "2011-08-08 00:54:02",
>      "2011-08-08 01:24:32", "2011-08-08 01:54:36", "2011-08-08 02:24:43",
>      "2011-08-08 02:55:01", "2011-08-08 03:25:28", "2011-08-08 03:56:08",
>      "2011-08-08 04:26:51", "2011-08-08 04:58:13", "2011-08-08 05:28:36",
>      "2011-08-08 05:59:54", "2011-08-08 06:30:34", "2011-08-08 07:01:21",
>      "2011-08-08 07:31:28", "2011-08-08 08:02:01", "2011-08-08 08:33:17",
>      "2011-08-08 09:04:20", "2011-08-08 09:34:28", "2011-08-08 10:05:04",
>      "2011-08-08 10:36:14", "2011-08-08 11:06:42", "2011-08-08 11:37:41",
>      "2011-08-08 12:07:54", "2011-08-08 12:38:18", "2011-08-08 13:08:45",
>      "2011-08-08 13:39:30", "2011-08-08 14:09:42", "2011-08-08 14:40:36",
>      "2011-08-08 15:10:31", "2011-08-08 15:41:00", "2011-08-08 16:11:10",
>      "2011-08-08 16:41:26", "2011-08-08 17:12:32", "2011-08-08 17:42:57",
>      "2011-08-08 18:13:38", "2011-08-08 18:43:59", "2011-08-08 19:14:12",
>      "2011-08-08 19:44:23", "2011-08-08 20:14:51", "2011-08-08 20:45:35",
>      "2011-08-08 21:16:14", "2011-08-08 21:46:44", "2011-08-08 22:16:57",
>      "2011-08-08 22:47:30", "2011-08-08 23:17:54", "2011-08-08 23:48:14",
>      "2011-08-09 00:18:39", "2011-08-09 00:48:45", "2011-08-09 01:19:12",
>      "2011-08-09 01:50:02", "2011-08-09 02:20:31", "2011-08-09 02:50:43",
>      "2011-08-09 03:21:43", "2011-08-09 03:52:16", "2011-08-09 04:22:48",
>      "2011-08-09 04:53:38", "2011-08-09 05:23:59", "2011-08-09 05:55:05",
>      "2011-08-09 06:25:28", "2011-08-09 06:55:47", "2011-08-09 07:26:36",
>      "2011-08-09 07:56:52", "2011-08-09 08:26:53", "2011-08-09 08:57:12",
>      "2011-08-09 09:27:36", "2011-08-09 09:58:09", "2011-08-09 10:30:14",
>      "2011-08-09 11:00:24", "2011-08-09 11:31:12", "2011-08-09 12:01:27",
>      "2011-08-09 12:31:27", "2011-08-09 13:02:00"), class = "factor"),
>      day = c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
>      2L, 2L, 2L, 2L, 2L, 2L, 2L), month = c(6L, 6L, 6L, 6L, 6L,
>      6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L, 6L
>      ), year = c(2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L,
>      2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L, 2008L,
>      2008L, 2008L, 2008L, 2008L), hour = c(18L, 18L, 18L, 18L,
>      18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L, 18L,
>      18L, 18L, 18L, 18L), minute = c(24L, 25L, 26L, 27L, 27L,
>      28L, 29L, 30L, 31L, 31L, 32L, 33L, 34L, 35L, 35L, 36L, 37L,
>      38L, 39L, 39L), seconds = c(37L, 25L, 13L, 1L, 51L, 37L,
>      26L, 13L, 1L, 50L, 38L, 26L, 14L, 2L, 50L, 38L, 25L, 14L,
>      2L, 50L), latitude = c(53.0086844, 53.0073172, 53.0072987,
>      53.0074199, 53.007425, 53.0074127, 53.0073899, 53.0074196,
>      53.007344, 53.0073058, 53.0073928, 53.0073665, 53.007368,
>      53.0073305, 53.0075514, 53.0062461, 53.0041679, 53.0030259,
>      53.0026628, 53.0016434), longitude = c(4.7152954, 4.7124807,
>      4.7124888, 4.7125712, 4.7124308, 4.7124896, 4.7124869, 4.7126068,
>      4.7126518, 4.7126989, 4.7126789, 4.7126554, 4.7126949, 4.7126662,
>      4.708657, 4.7018618, 4.696184, 4.6851359, 4.6724574, 4.6597175
>      ), altitude = c(11L, -8L, -6L, -7L, -8L, -7L, -5L, -7L, -9L,
>      -5L, -10L, -6L, -7L, -4L, -5L, 28L, 45L, 34L, 58L, 51L),
>      speed = c(NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_), speed3d = c(NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_
>      ), direction = c(271.44799390615, 249.033074730899, 248.73843730736,
>      250.246007582508, 250.764341582376, 250.399848123909, 250.072812233169,
>      250.125912183697, 248.844424558725, 248.110179425117, 249.482501827863,
>      249.167681054208, 249.054107842803, 248.593398667006, 259.287500573323,
>      256.334581772105, 251.368632221263, 254.263148255644, 257.77081842978,
>      258.781896557251), distance = c(195.533011252386, 411.015642749404,
>      411.251275242085, 401.36440658027, 410.030202131723, 406.774724318966,
>      407.802193484649, 399.134893410907, 399.261708269144, 397.888803717499,
>      395.636548779995, 398.140302980037, 395.611758173404, 398.90890022667,
>      650.976658981473, 1126.19200377051, 1555.81357970567, 2299.79354828882,
>      3133.08291135646, 3990.81515426576), userflag = c(0L, 0L,
>      0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
>      0L, 0L, 0L), species = structure(c(1L, 1L, 1L, 1L, 1L, 1L,
>      1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = "Larus
> fuscus", class = "factor"),
>      sex = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L,
>      2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("female",
>      "male"), class = "factor"), mass = c(960L, 960L, 960L, 960L,
>      960L, 960L, 960L, 960L, 960L, 960L, 960L, 960L, 960L, 960L,
>      960L, 960L, 960L, 960L, 960L, 960L), fduration = c(0.8, 0.8,
>      0.8, 0.833333333333333, 0.766666666666667, 0.816666666666667,
>      0.783333333333333, 0.8, 0.816666666666667, 0.8, 0.8, 0.8,
>      0.8, 0.8, 0.8, 0.783333333333333, 0.816666666666667, 0.8,
>      0.8, 1.03333333333333), cduration = c(0.891666666666667,
>      0.8, 0.8, 0.816666666666667, 0.8, 0.791666666666667, 0.8,
>      0.791666666666667, 0.808333333333333, 0.808333333333333,
>      0.8, 0.8, 0.8, 0.8, 0.8, 0.791666666666667, 0.8, 0.808333333333333,
>      0.8, 0.916666666666667), nestID = c(0L, 0L, 0L, 0L, 0L, 0L,
>      0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L),
>      long_trip = c(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
>      TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
>      TRUE, TRUE), color_ring = structure(c(23L, 23L, 23L, 23L,
>      23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L,
>      23L, 23L, 23L, 23L), .Label = c("FAAD", "FAAU", "FAAW", "FABN",
>      "FAJK", "FAJT", "FAKJ", "FAKK", "FAKL", "FAKN", "FAKS", "FAKU",
>      "FAKV", "FAPP", "FAPR", "FAPS", "MACN", "MACS", "MACT", "MACV",
>      "MAKM", "MAKT", "MAMA", "MAMB", "MAMJ", "MAMK", "MAML", "MAMM",
>      "MAMP", "MAPJ", "MAPK", "MAPL", "MAPM", "MAPN"), class = "factor"),
>      date_time.y = structure(c(8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L,
>      8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L, 8L), .Label =
> c("2008-05-24",
>      "2008-05-25", "2008-05-26", "2008-05-27", "2008-05-28", "2008-05-31",
>      "2008-06-01", "2008-06-02", "2008-06-03", "2008-06-04", "2008-06-05",
>      "2008-06-06", "2008-06-07", "2008-06-08", "2008-06-09", "2008-06-10",
>      "2008-06-11", "2008-06-12", "2008-06-13", "2008-06-14", "2008-06-15",
>      "2008-06-16", "2008-06-17", "2008-06-18", "2008-06-19", "2008-06-20",
>      "2008-06-21", "2008-06-24", "2008-06-25", "2008-06-26", "2008-06-27",
>      "2009-05-20", "2009-05-21", "2009-05-22", "2009-05-23", "2009-05-24",
>      "2009-05-25", "2009-05-26", "2009-05-27", "2009-05-28", "2009-05-29",
>      "2009-05-30", "2009-05-31", "2009-06-01", "2009-06-02", "2009-06-03",
>      "2009-06-04", "2009-06-05", "2009-06-06", "2009-06-07", "2009-06-08",
>      "2009-06-09", "2009-06-10", "2009-06-11", "2009-06-12", "2009-06-13",
>      "2009-06-14", "2009-06-15", "2009-06-16", "2009-06-17", "2009-06-18",
>      "2009-06-19", "2009-06-20", "2009-06-21", "2009-06-22", "2009-06-23",
>      "2009-06-24", "2009-06-25", "2009-06-26", "2009-06-27", "2009-06-28",
>      "2009-06-29", "2009-06-30", "2009-07-01", "2009-07-02", "2009-07-03",
>      "2009-07-04", "2009-07-05", "2009-07-06", "2009-07-07", "2009-07-08",
>      "2010-05-24", "2010-05-25", "2010-05-26", "2010-05-27", "2010-05-28",
>      "2010-05-29", "2010-05-30", "2010-05-31", "2010-06-01", "2010-06-02",
>      "2010-06-03", "2010-06-04", "2010-06-05", "2010-06-06", "2010-06-07",
>      "2010-06-08", "2010-06-09", "2010-06-10", "2010-06-11", "2010-06-12",
>      "2010-06-13", "2010-06-14", "2010-06-15", "2010-06-16", "2010-06-17",
>      "2010-06-18", "2010-06-19", "2010-06-20", "2010-06-21", "2010-06-22",
>      "2010-06-23", "2010-06-24", "2010-06-25", "2010-06-26", "2010-06-27",
>      "2010-06-28", "2010-06-29", "2010-06-30", "2010-07-01", "2010-07-02",
>      "2010-07-03", "2010-07-04", "2010-07-05", "2010-07-06", "2010-07-07",
>      "2010-07-08", "2010-07-09", "2010-07-10", "2010-07-11", "2010-07-12",
>      "2010-07-13", "2010-07-14", "2010-07-15", "2010-07-16", "2010-07-17",
>      "2010-07-18", "2010-07-19", "2010-07-20", "2010-07-21", "2010-07-22",
>      "2010-07-23", "2010-07-24", "2010-07-25", "2010-07-26", "2010-07-27",
>      "2010-07-28", "2010-07-29", "2010-07-30", "2010-07-31", "2010-08-01",
>      "2011-05-09", "2011-05-10", "2011-05-11", "2011-05-12", "2011-05-13",
>      "2011-05-14", "2011-05-15", "2011-05-16", "2011-05-17", "2011-05-18",
>      "2011-05-19", "2011-05-20", "2011-05-21", "2011-05-22", "2011-05-23",
>      "2011-05-24", "2011-05-25", "2011-05-26", "2011-05-27", "2011-05-28",
>      "2011-05-29", "2011-05-30", "2011-05-31", "2011-06-01", "2011-06-02",
>      "2011-06-03", "2011-06-04", "2011-06-05", "2011-06-06", "2011-06-07",
>      "2011-06-08", "2011-06-09", "2011-06-10", "2011-06-11", "2011-06-12",
>      "2011-06-13", "2011-06-14", "2011-06-15", "2011-06-16", "2011-06-17",
>      "2011-06-18", "2011-06-19", "2011-06-20", "2011-06-21", "2011-06-22",
>      "2011-06-23", "2011-06-24", "2011-06-25", "2011-06-26", "2011-06-27",
>      "2011-06-28", "2011-06-29", "2011-06-30", "2011-07-01", "2011-07-02",
>      "2011-07-03", "2011-07-04", "2011-07-05", "2011-07-06", "2011-07-07",
>      "2011-07-08", "2011-07-09", "2011-07-10", "2011-07-11", "2011-07-12",
>      "2011-07-13", "2011-07-14", "2011-07-15", "2011-07-16", "2011-07-17",
>      "2011-07-18", "2011-07-19", "2011-07-20", "2011-07-21", "2011-07-22",
>      "2011-07-23", "2011-07-24", "2011-07-25", "2011-07-26", "2011-07-27",
>      "2011-07-28", "2011-07-29", "2011-07-30", "2011-07-31", "2011-08-01",
>      "2011-08-02", "2011-08-03", "2011-08-04", "2011-08-05", "2011-08-07",
>      "2011-08-08", "2011-08-09"), class = "factor"), breeding_status =
> structure(c(4L,
>      4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L,
>      4L, 4L, 4L, 4L), .Label = c("Chick care", "Fledging", "Hatching",
>      "Incubation", "Laying"), class = "factor"), breeding_phase = c(1L,
>      1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
>      1L, 1L, 1L, 1L), habitat = structure(c(7L, 1L, 1L, 1L, 1L,
>      1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 4L, 4L, 4L, 4L, 4L, 4L
>      ), .Label = c("Beach", "Ijselmeer", "Mainland", "NorthSea",
>      "RazBol", "SWDelta", "Texel", "Wadden"), class = "factor"),
>      fdistance = c(392.362981661686, 347.822778347897, 2.2399055005,
>      16.2634200757001, 15.6264031033472, 6.68071975539527, 2.54516631710756,
>      13.7364019619101, 9.76119770102169, 6.7361280512109, 9.8972090447322,
>      3.91553096239263, 4.39658439806874, 5.24116438874534, 446.600312363533,
>      769.530802963015, 672.227933532991, 1235.34304431045, 1410.75706207244,
>      1421.51113768455), cdistance = c(370.092880004792, 175.031341924199,
>      9.25166278810007, 15.9449115895237, 11.1535614293712, 4.61294303625141,
>      8.14078413950882, 11.7487998314659, 8.2486628761163, 8.31666854797155,
>      6.90637000356241, 4.15605768023068, 4.81887439340704, 225.920738376139,
>      608.065557663274, 720.879368248003, 953.785488921723, 1323.05005319145,
>      1416.1340998785, 1635.57088162511), nest_time_min = c(NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_), avr_speed = c(NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_, NA_real_, NA_real_,
>      NA_real_, NA_real_, NA_real_, NA_real_), max_distance = c(FALSE,
>      FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE,
>      FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE,
>      FALSE), trip_time_min = c(460.641666666667, 460.641666666667,
>      460.641666666667, 460.641666666667, 460.641666666667, 460.641666666667,
>      460.641666666667, 460.641666666667, 460.641666666667, 460.641666666667,
>      460.641666666667, 460.641666666667, 460.641666666667, 460.641666666667,
>      460.641666666667, 460.641666666667, 460.641666666667, 460.641666666667,
>      460.641666666667, 460.641666666667), dist_trav = c(81033.8438710604,
>      81033.8438710604, 81033.8438710604, 81033.8438710604, 81033.8438710604,
>      81033.8438710604, 81033.8438710604, 81033.8438710604, 81033.8438710604,
>      81033.8438710604, 81033.8438710604, 81033.8438710604, 81033.8438710604,
>      81033.8438710604, 81033.8438710604, 81033.8438710604, 81033.8438710604,
>      81033.8438710604, 81033.8438710604, 81033.8438710604)), .Names =
> c("tripID",
> "device_info_serial", "mdate", "date_time.x", "day", "month",
> "year", "hour", "minute", "seconds", "latitude", "longitude",
> "altitude", "speed", "speed3d", "direction", "distance", "userflag",
> "species", "sex", "mass", "fduration", "cduration", "nestID",
> "long_trip", "color_ring", "date_time.y", "breeding_status",
> "breeding_phase", "habitat", "fdistance", "cdistance", "nest_time_min",
> "avr_speed", "max_distance", "trip_time_min", "dist_trav"), row.names =
> 1765:1784, class = "data.frame")
>
>
> I have tried your suggestion, but there are 2 problems:
>
> 1) The time column is in this format: "%Y-%m-%d %H:%M:%S". I have solved
> this problem before using:
>
> strptime(long$date_time.x, format = "%Y-%m-%d %H:%M:%S")
>
> I am not sure where to implement this in your suggestion.
>
> 2) I am not sure if I should replace your x with anything.
>
> I tried:
>
> departures<- lapply(split(long, list(long$device_info_serial,
> long$tripID)), function(x) x[strptime(long$date_time.x, format = "%Y-%m-%d
> %H:%M:%S") == min(strptime(long$date_time.x, format = "%Y-%m-%d
> %H:%M:%S")),])
> do.call(rbind, departures)
>
> R started calculating for hours and it hadn't even finished after I left it
> overnight. I'm not sure whether this is because my laptop is too slow or the
> dataset is too big, but my guess is I'm doing something wrong.
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/noob-requesting-help-tp4632803p4633252.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



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