r - Time series of length 0 from the timeSeries package has dubious timestamps -

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it seems "timeseries" of length 0 has 2 timestamps, 0 , 1. assignment of length 0 vector doesn't cause error message, number , values of timestamps unchanged. assignment of timestamps themselfs results in error message:

> library(timeseries)  > x <- timeseries( matrix(0:3,2,2) )  > settime(x) <- timesequence(as.date("2015-01-01"),as.date("2015-01-02"),by=as.difftime(1,units="days"))  > # --------------------- > # exspected: >  > head(x,2) gmt            ss.1 ss.2 2015-01-01    0    2 2015-01-02    1    3  > gettime(head(x,2)) gmt [1] [2015-01-01] [2015-01-02]  > nrow(head(x,2)) [1] 2  > length(gettime(head(x,2))) [1] 2  > # --------------------- > # exspected: >  > head(x,1) gmt            ss.1 ss.2 2015-01-01    0    2  > gettime(head(x,1)) gmt [1] [2015-01-01]  > nrow(head(x,1)) [1] 1  > length(gettime(head(x,1))) [1] 1  > # --------------------- > # not exspected: >  > head(x,0) gmt      ss.1 ss.2  > gettime(head(x,0)) [1] 1 0  > nrow(head(x,0)) [1] 0  > length(gettime(head(x,0))) [1] 2  > #==================================== >  > x0 <- head(x,0)  > # try assign vector of length 0 time(x0): > settime(x0) <- integer(0)  > gettime(x0)  # no success, neither error nor warning [1] 1 0  > #try assign current value of time(x0) itself: > settime(x0) <- gettime(x0) error: initialize timeseries : length of '@positions' not equal '@.data' extent

is bug in "timeseries" package?

from documentation of "timeseries" package learn "gettime" synonym "time". hence looking source code of function:

> getmethod("time",signature=c(x="timeseries")) method definition:  function (x, ...)  .time.timeseries(x, ...) <environment: namespace:timeseries>  signatures:         x            target  "timeseries" defined "timeseries"

so need source code of function, ".time.timeseries", used internally "timeseries" package:

> getanywhere(".time.timeseries") single object matching ‘.time.timeseries’ found found in following places   package:timeseries   namespace:timeseries value  function (x, ...)  {     if (length(x@positions) > 0)          timedate(x@positions, zone = "gmt", fincenter = x@fincenter)     else seq.int(nrow(x)) } <environment: namespace:timeseries> >

here see bug. "seq.int(nrow(x))" sequence 1,...,nrow(x)

  • in steps of 1, if nrow(x)>=1, but

  • in steps of -1, if nrow(x)<1.

hence in particular case, length of time series 0, value of "time" sequence "c(1,0)". 1 can fix follows:

seq.int(1,nrow(x),length.out=nrow(x))

gives rather correct value "integer(0)" if "nrow(x)" 0.


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