Gabor,
Thanks for that!
Now, does anyone know how to plot times on an axis of an xy plot?
On Mar 6, 2006, at 4:20 PM, Gabor Grothendieck wrote:
POSIXlt stores its data in a 9 component structure so its
length is always 9. See R News 4/1 help desk article for more info.
To get what you are looking for try using POSIXct, not POSIXlt:
length(as.POSIXct(times))
On 3/6/06, Jason Horn <jhorn@bu.edu> wrote:
I have a vector of POSIX times/dates (called "times") that I want to
plot. But I'm having trouble because R reports the length of the
vector incorrectly. Can someone help me figure out what's going on
here?
This code....
print(times)
print(class(times))
print(length(times))
Produces this...
.
[355] "2006-03-06 18:34:00" "2006-03-06 18:32:00" "2006-03-06 18:31:00"
[358] "2006-03-06 18:30:00" "2006-03-06 18:29:00" "2006-03-06 18:27:00"
[361] "2006-03-06 18:26:00" "2006-03-06 18:25:00" "2006-03-06 18:24:00"
[364] "2006-03-06 18:23:00" "2006-03-06 18:21:00" "2006-03-06 18:20:00"
[1] "POSIXt" "POSIXlt"
[1] 9
Huh? As you can see there are 365 entries in the "times" vector.
Why does R think there are only 9?
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Jason,
try this nonsense example:
year <- 2006
year2 <- 2006
month <- 1
month2 <- 3
daysequence <- seq(ISOdate(year, month, 1),ISOdate(year2, month2, 1), "days")
str(daysequence)
curve <- sin(seq(1,length(daysequence)))
plot(daysequence,curve)
See also the as.POSIXct() function.
Markus
On Mon, Mar 06, 2006 at 04:44:45PM -0500, Jason Horn wrote:
Gabor,
Thanks for that!
Now, does anyone know how to plot times on an axis of an xy plot?
On Mar 6, 2006, at 4:20 PM, Gabor Grothendieck wrote:
>POSIXlt stores its data in a 9 component structure so its
>length is always 9. See R News 4/1 help desk article for more info.
>To get what you are looking for try using POSIXct, not POSIXlt:
>
>length(as.POSIXct(times))
>
>
>On 3/6/06, Jason Horn <jhorn@bu.edu> wrote:
>>I have a vector of POSIX times/dates (called "times") that I want to
>>plot. But I'm having trouble because R reports the length of the
>>vector incorrectly. Can someone help me figure out what's going on
>>here?
>>
>>This code....
>>
>>print(times)
>>print(class(times))
>>print(length(times))
>>
>>
>>Produces this...
>>.
>>.
>>.
>>[355] "2006-03-06 18:34:00" "2006-03-06 18:32:00" "2006-03-06
>>18:31:00"
>>[358] "2006-03-06 18:30:00" "2006-03-06 18:29:00" "2006-03-06
>>18:27:00"
>>[361] "2006-03-06 18:26:00" "2006-03-06 18:25:00" "2006-03-06
>>18:24:00"
>>[364] "2006-03-06 18:23:00" "2006-03-06 18:21:00" "2006-03-06
>>18:20:00"
>>[1] "POSIXt" "POSIXlt"
>>[1] 9
>>
>>Huh? As you can see there are 365 entries in the "times" vector.
>>Why does R think there are only 9?
>>
>>
>>
>> [[alternative HTML version deleted]]
>>
>>______________________________________________
>>R-help@stat.math.ethz.ch mailing list
>>https://stat.ethz.ch/mailman/listinfo/r-help
>>PLEASE do read the posting guide! http://www.R-project.org/posting-
>>guide.html
>>
>
--
Markus Neteler <neteler itc it> http://mpa.itc.it
ITC-irst - Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18 - 38050 Povo (Trento), Italy