[R] How to use as.Date (or something else) with "31-Jul-2010 23:59:00"
Eduardo M. A. M.Mendes
emammendes at gmail.com
Fri Jul 29 00:54:41 CEST 2011
Sorry for not replying earlier but I have followed advice and read as much
documentation as I could.
I managed to get a zoo object the way I want
dadoszoo : 'zoo' series from 2010-06-27 to 2010-08-05
Data: num [1:56161, 1:14] 74 74.2 74.2 74.1 73.9 ...
Index: POSIXct[1:56161], format: "2010-06-27 00:00:00" "2010-06-27
I did not manage to get plot.zoo to give x-axis a nice format (I only got
Jun 30 Jul10 Jul 20 Jul 30). I guess the way to change it is the
documentation too but I am yet to find it.
From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com]
Sent: Tuesday, July 26, 2011 8:31 PM
To: Eduardo Mendes
Cc: r-help at r-project.org
Subject: Re: [R] How to use as.Date (or something else) with "31-Jul-2010
On Tue, Jul 26, 2011 at 7:18 PM, Eduardo Mendes <emammendes at gmail.com>
> Hello again
> I do apologize for the previous email without any useful information
> that can lead to an answer. To those who felt offended by "to no
> avail", I do apologize again. I guess I will be always a newbie as
> far as R is concerned.
> The date format was wrong and although I have tried to use different
> formats I could not get the result I wanted. So I went back to the
> file and changed to a format that R can understand (Please understand
> that R is very likely to have package that I might be unaware of).
> Now all dates are
>  "POSIXct" "POSIXt"
>  "2010-06-27 00:00:00 BRT" "2010-06-27 00:01:00 BRT"
> If I issue the command as.Date(data$TempDate), the information on
> hour, minute and second is lost
>  "2010-06-27"
> If I use data$TempDate in a zoo object, I got the following msg
> some methods for "zoo" objects do not work if the index entries in
> are not unique
> If I issue plot(zoo object), the result is a mess since many values do
> not have an unique entry (as expected).
> How can I use the information on data$TempDate to create unique
> indexes for zoo objects and the like?
Read R News 4/1 and its references to find out about R's date time classes
and then read the 5 vignettes (PDF documents) that come with zoo for many
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
email: ggrothendieck at gmail.com
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