Hi Gabor,
Not sure where to report this, but
Mac 10.5.8
R: 11.1
When you examine the zoo vignette and hit the back button, you get a hang.
I havent tested with other vignettes and cant imagine that is is specific to
yours
FWIW.
Did I mention that zoo is great. Thx for your work on it.
On Tue, Jun 15, 2010 at 6:30 AM, Gabor Grothendieck <ggrothendi...@gmail.com
> wrote:
> On Tue, Jun 15, 2010 at 8:27 AM, skan <juanp...@gmail.com> wrote:
> >
> > Hello
> >
> > Where could I find examples on how to work with the time index in a
> > timeseries or zoo series?
> >
> > Let say I've got this series
> >
> > DATA
> > 1990-01-01 10:00:00 0.900
> > 1990-01-01 10:01:00 0.910
> > 1990-01-01 10:03:00 0.905
> > 1990-01-01 10:04:00 0.905
> > 1990-01-01 10:05:00 0.890
> >
> > .......................
> >
> > 2000-12-31 20:00:00 0.992
> >
> >
> > How do I make simple calculations such as ... ?
> > Calculate the mean of the first data every day. (mapply, for loop, tapply
> ?)
> > Transform data to a table, with dates in one axis and times in the
> other.
> >
>
> There are three vignettes that come with zoo. vignette() lists their
> names and vignette("zoo") displays the one called zoo (similarly for
> the other two). Also see the help files: ?zoo, ?read.zoo,
> ?aggregate.zoo
> and note the examples at the bottom of the help files.
> Also library(help = zoo) lists the help files available.
>
> Lines <- "1990-01-01 10:00:00 0.900
> 1990-01-01 10:01:00 0.910
> 1990-01-01 10:03:00 0.905
> 1990-01-01 10:04:00 0.905
> 1990-01-01 10:05:00 0.890
> 1990-01-02 10:00:00 0.940
> 1990-01-02 10:01:00 0.990"
> library(zoo)
> library(chron)
> z <- read.zoo(textConnection(Lines), index = 1:2, FUN = function(x)
> as.chron(paste(x[,1], x[,2])))
>
> # take first data value for each day and then take their mean
> mean(aggregate(z, as.Date, head, 1))
>
> # create data frame from z made up of dates, times and value
> # dates and times are chron package functions.
> # (If you use a different date and time class then it would be different.)
> data.frame(dates = dates(time(z)), times = times(time(z)), value =
> coredata(z))
>
> ______________________________________________
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