R help - Mar 2007 - aggregating data with Zoo

Is there a way of aggregating 'zoo' daily data according to day of week?
eg
all Thursdays

I came across the 'nextfri' function in the documentation but am unsure
how
to change this so any day of week can be aggregated.

I have used POSIX to arrange the data (not as 'zoo' series) according to
day
of week, but am curious if I've missed if a similar option available with 
zoo.

Thank you for any help,

Alf Sammassimo
Melbourne, Australia

Please read the last line on every post to r-help.

On 3/28/07, Alfonso Sammassimo <cincinattikid at bigpond.com>
wrote:
> Is there a way of aggregating 'zoo' daily data according to day of
week? eg
> all Thursdays
>
> I came across the 'nextfri' function in the documentation but am
unsure how
> to change this so any day of week can be aggregated.
>
> I have used POSIX to arrange the data (not as 'zoo' series)
according to day
> of week, but am curious if I've missed if a similar option available
with
> zoo.
>
> Thank you for any help,
>
> Alf Sammassimo
> Melbourne, Australia
>
> ______________________________________________
> R-help at 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
> and provide commented, minimal, self-contained, reproducible code.
>

On Wed, 28 Mar 2007, Alfonso Sammassimo wrote:
> Is there a way of aggregating 'zoo' daily data according to day of
week? eg
> all Thursdays
Sure, the easiest way will probably differ depending on the time stamp 
class. One example might be this:
   ## small example with Date index
   z <- read.zoo(file.path(.find.package("zoo"), "doc",
"demo1.txt"),
                 sep = "|", format = "%d %b %Y")
   ## visualization
   plot(z)
   ## aggregate along week days (via POSIXlt representation)
   aggregate(z, as.POSIXlt(time(z))$wday, mean)

hth,
Z
> I came across the 'nextfri' function in the documentation but am
unsure how
> to change this so any day of week can be aggregated.
>
> I have used POSIX to arrange the data (not as 'zoo' series)
according to day
> of week, but am curious if I've missed if a similar option available
with
> zoo.
>
> Thank you for any help,
>
> Alf Sammassimo
> Melbourne, Australia
>
> ______________________________________________
> R-help at 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
> and provide commented, minimal, self-contained, reproducible code.
>
>