Last line in the following (updated) code produces the error
require(raster)
require(rts)
require(stringr)
r <- raster(ncol=100, nrow=100)
values(r) <- runif(ncell(r))
stack(r)->s
r->rs
for(i in 1:23){
rs[]<-r[]*i
addLayer(s,rs)->s
print(nlayers(s))
}
dt<-list(ID=seq(1:24),month=rep(formatC(1:12,flag=0,width=2),2),
year=sort(rep(2016:2017,12)))
timelst<-paste0(unlist(dt['year']),'-',unlist(dt['month']),"-01")
strptime(timelst,format="%Y-%m-%d")->t1
rts(s,time=as.yearmon(t1))->rsts
subset(rsts,'2017')->r2017
class(r2017@time)
class(rsts@time)
apply.monthly(rsts,mean)
-----Original Message-----
From: David Winsemius [mailto:dwinsem...@comcast.net]
Sent: Tuesday, 6 March 2018 11:10 AM
To: Herr, Alexander (L&W, Black Mountain) <alexander.h...@csiro.au>
Cc: r-help@r-project.org
Subject: Re: [R] raster time series statistics
> On Mar 5, 2018, at 3:28 PM, <alexander.h...@csiro.au>
> <alexander.h...@csiro.au> wrote:
>
> Hi List,
>
> The following code returns an "Error in as.POSIXlt.character(x, tz, ...) :
> character string is not in a standard unambiguous format"
I'm unable to produce that error. Which function was being evaluated to produce
the error? I don't see where as.POSIXlt would have been called. You don't have
any Date or POSIXt-classed variables. (I did need to also load the stringr
package to get str_pad into my workspace.)
>
> require(raster)
> require(rts)
> require(stringi)
> r <- raster(ncol=100, nrow=100)
> values(r) <- runif(ncell(r))
> list(ID=seq(1:24),month=rep(str_pad(1:12, pad = 0,width = 2 ,
> "left"),2),year=sort(rep(2016:2017,12)))->dt
> stack(r)->s
> r->rs
> for(i in 1:23){
> rs[]<-r[]*i
> addLayer(s,rs)->s
> print(nlayers(s))
> }
> timelst<-paste0(unlist(dt['year']),'-',unlist(dt['month']))
> rts(s,time=as.yearmon(timelst))->rsts
> str(rsts@time)
> apply.monthly(rsts,mean)
>
> I was expecting that the statistics accept the yearmonth format of the
> timeslot, as it allows subsetting.
> Any suggestions?
> Thanks
> Herry
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.'
-Gehm's Corollary to Clarke's Third Law
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
