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...), : non-intersecting series and indeed, comparing the indices gives: > time(x)[1]-time(z)[1] [1] 3.183231e-12 Is this a bug in R, or is it one of the expected precision errors due to the use of limited precision floats? I am using R 3.4.0 (2017-04-21) on Windows (64-bit). Thaks! Andrea Altomani

...In my case: - x and y have the same index. - the subtraction operator recognizes this, and create a new ts with one entry - the result of the subtraction has an index which is different from the input. This is very surprising to me, and I am curious to understand the problem. -- Andrea Altomani On Fri, Sep 1, 2017 at 5:53 PM Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote: > You already know the answer. Why ask? > -- > Sent from my phone. Please excuse my brevity. > > On September 1, 2017 7:23:24 AM PDT, Andrea Altomani < > altomani.andrea at gmail.com&gt...

You already know the answer. Why ask? -- Sent from my phone. Please excuse my brevity. On September 1, 2017 7:23:24 AM PDT, Andrea Altomani <altomani.andrea at gmail.com> wrote: >I have a time series x, and two other series obtained from it: > >x <- structure(2017, .Tsp = c(2017.41666666667, 2017.41666666667, 12), >class = "ts") >y <- floor(x) >z <- x-y > >I would expect the three series...

...create the series using structure(), that was the result of dump() on an intermediate object created within tsdisagg::ta(), which is where I found the error in the first place. ta() indeed manipulates .Tsp directly, rather than using ts. I guess this is a bug in tsdisagg then. Thanks! -- Andrea Altomani On Sat, Sep 2, 2017 at 12:31 AM Achim Zeileis <Achim.Zeileis at uibk.ac.at> wrote: > On Fri, 1 Sep 2017, Andrea Altomani wrote: > > > I should have formulated my question in a more specific way. > > > > 1. I suspect this is a floating point precision issue. I am not...

On Fri, 1 Sep 2017, Andrea Altomani wrote: > I should have formulated my question in a more specific way. > > 1. I suspect this is a floating point precision issue. I am not very > knowledgeable about R internals, can someone else confirm it? Yes. If you represent a series with increment 1/12 it depends on how you do...