Hi,
Might you simply reorder the stack after zApply()?
> x2 <- x[[month.name]]
> names(x2)
[1] "January" "February" "March" "April" "May" "June"
[7] "July" "August" "September" "October" "November" "December"
Cheers,
Ben
> On Jul 29, 2016, at 10:52 AM, Dominik Schneider <dosc3...@colorado.edu> wrote:
>
> Sorry I'm not sure how to fix this, but it looks like the months are in
> alphanumeric order, indicating they are being treated as a factor. Might be
> worth a bug report?
>
>
>
> On Thursday, July 28, 2016, Thiago V. dos Santos via R-sig-Geo <
> r-sig-geo@r-project.org> wrote:
>
>> Dear all,
>>
>> I am using the raster package to calculate monthly averages of climatic
>> variables.
>>
>> Essentially, this is the function I use:
>>
>> library(raster)
>>
>> # Create date sequence
>> idx <- seq(as.Date("1996/1/1"), as.Date("2010/12/31"), by = "day")
>>
>> # Create raster stack and assign dates
>> r <- raster(ncol=5, nrow=5)
>> s <- stack(lapply(1:length(idx), function(x) setValues(r,
>> runif(ncell(r)))))
>> s <- setZ(s, idx)
>>
>> # Calculate monthly average
>> x <- zApply(s, by=months, mean, name=month.abb[])
>>
>> names(x)
>> [1] "April" "August" "December" "February" "January" "July" "June"
>> [8] "March" "May" "November" "October" "September"
>> getZ(x)
>> [1] "April" "August" "December" "February" "January" "July" "June"
>> [8] "March" "May" "November" "October" "September"
>>
>>
>> The problem here is the output of both names(x) and getZ(x). It looks like
>> a random month order is returned (even though I provide the labels), which
>> makes me confused about the results.
>>
>>
>> By performing the same calculation in a different software and comparing
>> the results, I came to realize that the order of months for the results by
>> raster should, in fact, be Jan-Feb-Mar-Apr-May-Jun-Jul-Aug-Sep-Oct-Nov-Dec
>>
>> How can I control the way raster delivers the object names after using
>> zApply, in order to sort the months in the "natural" order?
>>
>> Greetings, -- Thiago V. dos Santos
>>
>> PhD student
>> Land and Atmospheric Science
>> University of Minnesota
>>
>> _______________________________________________
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>> R-sig-Geo@r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
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>
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Ben Tupper
Bigelow Laboratory for Ocean Sciences
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