[R] creating a time series

Hello everyone, � had 15 minutes of data from 2017-11-02 13:30:00 to 2022-11-26 23:45:00 and number of data is 177647 � would like to ask why my time series are less then my expectation. baslangic <- as.POSIXct("2017-11-02 13:30:00", tz = "CET") bitis <- as.POSIXct("2022-11-26 23:45:00", tz

Re: [R] creating a time series

Às 11:12 de 16/10/2023, ahmet varlı escreveu: Hello everyone, � had 15 minutes of data from 2017-11-02 13:30:00 to 2022-11-26 23:45:00 and number of data is 177647 � would like to ask why my time series are less then my expectation. baslangic <- as.POSIXct("2017-11-02 13:30:00", tz = "CET"

Re: [R] creating a time series

Why did you expect to have 177647 elements ? I found that 177642 is the correct number: Marc baslangic <- as.POSIXct("2017-11-02 13:30:00", tz = "CET") bitis <- as.POSIXct("2022-11-26 23:45:00", tz = "CET")  # zaman_seti <- seq.POSIXt(from = baslangic, to = bitis, by = 60 * 15) y2017_11_02 <-

Re: [R] Create new data frame with conditional sums

Dear Jason, The code could look something like: dummyData = data.frame(Tract=seq(1, 10, by=1),     Pct = c(0.05,0.03,0.01,0.12,0.21,0.04,0.07,0.09,0.06,0.03),     Totpop = c(4000,3500,4500,4100,3900,4250,5100,4700,4950,4800)) # Define the cutoffs # - allow for duplicate entries; by = 0.03; # by

[R] Ynt: creating a time series

hello, because ı have data between these times and it has 177647 elements Gönderen: Marc Girondot via R-help adına R-help Gönderildi: 16 Ekim 2023 Pazartesi 13:43 Kime: r-help@r-project.org Konu: Re: [R] creating a time series Why did you expect to have 177647

Re: [R] Create new data frame with conditional sums

If one makes the reasonable assumption that Pct is much larger than Cutoff, sorting Cutoff is the expensive part e.g O(nlog2(n) for Quicksort (n = length Cutoff). I believe looping is O(n^2). Jeff's approach using findInterval may be faster. Of course implementation details matter. -- Bert On Mo

Re: [R] Ynt: creating a time series

Then your data has extra data points... either duplicates or records with timestamps not on 15min intervals. On October 16, 2023 7:29:25 AM PDT, "ahmet varlı" wrote: >hello, > >because ı have data between these times and it has 177647 elements > >Gönderen: Marc

Re: [R] Create new data frame with conditional sums

Sorry, misstatements. It should (of course) read: If one makes the reasonable assumption that Pct is much larger than Cutoff, sorting Pct is the expensive part e.g O(nlog2(n) for Quicksort (n = length Pct). I believe looping is O(n^2). etc. On Mon, Oct 16, 2023 at 7:48 AM Bert Gunter wrote: > >