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Kindra Martinenko

2010-Mar-04 21:45 UTC

[R] missing date and time intervals in data frame

I posted a similar question, but feel it needs a bit more elaboration.

I have a data frame (read from a csv file) that may have missing rows.  Each
day has 7 time intervals associated with it, with a range from 17:00 hrs to
18:00 hrs in 10 minute bins.

What I am looking for is a script that will run through the data frame and
insert "NA"in the Volume column for any dates that are missing a time
interval.  For example:

          Date            Time             Camera
 Volume
57  2009-10-09 5:00:00 PM MANBRIN_RIVER_NB    210
58  2009-10-09 5:10:00 PM MANBRIN_RIVER_NB    207
59  2009-10-09 5:20:00 PM MANBRIN_RIVER_NB    250
60  2009-10-09 5:30:00 PM MANBRIN_RIVER_NB    193
61  2009-10-09 5:40:00 PM MANBRIN_RIVER_NB    205
62  2009-10-09 6:00:00 PM MANBRIN_RIVER_NB    185

Note that between row 61 and row 62, there is a missing time interval (5:50
PM).  I want the data frame to look like this:

     Date                 Time           Camera
 Volume
57  2009-10-09 5:00:00 PM MANBRIN_RIVER_NB    210
58  2009-10-09 5:10:00 PM MANBRIN_RIVER_NB    207
59  2009-10-09 5:20:00 PM MANBRIN_RIVER_NB    250
60  2009-10-09 5:30:00 PM MANBRIN_RIVER_NB    193
61  2009-10-09 5:40:00 PM MANBRIN_RIVER_NB    205
*62  2009-10-09 5:50:00 PM MANBRIN_RIVER_NB  NA*
62  2009-10-09 6:00:00 PM MANBRIN_RIVER_NB    185


Thanks in advance,
Kindra

	[[alternative HTML version deleted]]

David Winsemius

2010-Mar-04 22:11 UTC

head link

[R] missing date and time intervals in data frame

On Mar 4, 2010, at 4:45 PM, Kindra Martinenko wrote:
> I posted a similar question, but feel it needs a bit more elaboration.
>
> I have a data frame (read from a csv file) that may have missing  
> rows.  Each
> day has 7 time intervals associated with it, with a range from 17:00  
> hrs to
> 18:00 hrs in 10 minute bins.
>
> What I am looking for is a script that will run through the data  
> frame and
> insert "NA"in the Volume column for any dates that are missing a
time
> interval.  For example:
>
>          Date            Time             Camera
> Volume
> 57  2009-10-09 5:00:00 PM MANBRIN_RIVER_NB    210
> 58  2009-10-09 5:10:00 PM MANBRIN_RIVER_NB    207
> 59  2009-10-09 5:20:00 PM MANBRIN_RIVER_NB    250
> 60  2009-10-09 5:30:00 PM MANBRIN_RIVER_NB    193
> 61  2009-10-09 5:40:00 PM MANBRIN_RIVER_NB    205
> 62  2009-10-09 6:00:00 PM MANBRIN_RIVER_NB    185
Here is one method of generating a series of time points at 10 minute  
intervals:

 > as.POSIXlt("5:00:00 PM", format="%I:%M:%s %p" ) +
(1:20)*60*10
  [1] "2010-03-04 05:10:00 EST" "2010-03-04 05:20:00 EST"
"2010-03-04
05:30:00 EST"
  [4] "2010-03-04 05:40:00 EST" "2010-03-04 05:50:00 EST"
"2010-03-04
06:00:00 EST"
  [7] "2010-03-04 06:10:00 EST" "2010-03-04 06:20:00 EST"
"2010-03-04
06:30:00 EST"
[10] "2010-03-04 06:40:00 EST" "2010-03-04 06:50:00 EST"
"2010-03-04
07:00:00 EST"
[13] "2010-03-04 07:10:00 EST" "2010-03-04 07:20:00 EST"
"2010-03-04
07:30:00 EST"
[16] "2010-03-04 07:40:00 EST" "2010-03-04 07:50:00 EST"
"2010-03-04
08:00:00 EST"
[19] "2010-03-04 08:10:00 EST" "2010-03-04 08:20:00 EST"

Applying that to the solution you referenced should finish the job.

-- 
David.>
> Note that between row 61 and row 62, there is a missing time  
> interval (5:50
> PM).  I want the data frame to look like this:
>
>     Date                 Time           Camera
> Volume
> 57  2009-10-09 5:00:00 PM MANBRIN_RIVER_NB    210
> 58  2009-10-09 5:10:00 PM MANBRIN_RIVER_NB    207
> 59  2009-10-09 5:20:00 PM MANBRIN_RIVER_NB    250
> 60  2009-10-09 5:30:00 PM MANBRIN_RIVER_NB    193
> 61  2009-10-09 5:40:00 PM MANBRIN_RIVER_NB    205
> *62  2009-10-09 5:50:00 PM MANBRIN_RIVER_NB  NA*
> 62  2009-10-09 6:00:00 PM MANBRIN_RIVER_NB    185
>
>
> Thanks in advance,
> Kindra
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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, MD
Heritage Laboratories
West Hartford, CT

Gabor Grothendieck

2010-Mar-05 00:55 UTC

head link

[R] missing date and time intervals in data frame

Try this:


Lines <- "Date,Time,Camera,Volume
57,2009-10-09,5:00:00 PM,MANBRIN_RIVER_NB,210
58,2009-10-09,5:10:00 PM,MANBRIN_RIVER_NB,207
59,2009-10-09,5:20:00 PM,MANBRIN_RIVER_NB,250
60,2009-10-09,5:30:00 PM,MANBRIN_RIVER_NB,193
61,2009-10-09,5:40:00 PM,MANBRIN_RIVER_NB,205
62,2009-10-09,6:00:00 PM,MANBRIN_RIVER_NB,185"

# read data
DF <- read.csv(textConnection(Lines), as.is = TRUE)

library(zoo)
library(chron)

# convert to zoo
z <- zoo(DF$Volume, as.chron(paste(DF$Date, DF$Time), "%Y-%m-%d %H:%M:%S
%p"))

# convert to ts which makes it regularly spaced and back to zoo
zz <- as.zoo(as.ts(z))

# fixup times as converting to ts loses the time class but not the time values
time(zz) <- as.chron(time(zz)

At this point zz is a regularly spaced zoo object.  coredata(zz) are
its values and time(zz) are its times.> zz(10/09/09 05:00:00) (10/09/09 05:10:00) (10/09/09 05:20:00) (10/09/09 05:30:00)
                210                 207                 250                 193
(10/09/09 05:40:00) (10/09/09 05:50:00) (10/09/09 06:00:00)
                205                  NA                 185

There are further examples in ?merge.zoo and vignette("zoo")

Also see R News 4/1 on dates and times.


On Thu, Mar 4, 2010 at 4:45 PM, Kindra Martinenko <kmartinenko at
gmail.com> wrote:> I posted a similar question, but feel it needs a bit more elaboration.
>
> I have a data frame (read from a csv file) that may have missing rows.
?Each
> day has 7 time intervals associated with it, with a range from 17:00 hrs to
> 18:00 hrs in 10 minute bins.
>
> What I am looking for is a script that will run through the data frame and
> insert "NA"in the Volume column for any dates that are missing a
time
> interval. ?For example:
>
> ? ? ? ? ?Date ? ? ? ? ? ?Time ? ? ? ? ? ? Camera
> ?Volume
> 57 ?2009-10-09 5:00:00 PM MANBRIN_RIVER_NB ? ?210
> 58 ?2009-10-09 5:10:00 PM MANBRIN_RIVER_NB ? ?207
> 59 ?2009-10-09 5:20:00 PM MANBRIN_RIVER_NB ? ?250
> 60 ?2009-10-09 5:30:00 PM MANBRIN_RIVER_NB ? ?193
> 61 ?2009-10-09 5:40:00 PM MANBRIN_RIVER_NB ? ?205
> 62 ?2009-10-09 6:00:00 PM MANBRIN_RIVER_NB ? ?185
>
> Note that between row 61 and row 62, there is a missing time interval (5:50
> PM). ?I want the data frame to look like this:
>
> ? ? Date ? ? ? ? ? ? ? ? Time ? ? ? ? ? Camera
> ?Volume
> 57 ?2009-10-09 5:00:00 PM MANBRIN_RIVER_NB ? ?210
> 58 ?2009-10-09 5:10:00 PM MANBRIN_RIVER_NB ? ?207
> 59 ?2009-10-09 5:20:00 PM MANBRIN_RIVER_NB ? ?250
> 60 ?2009-10-09 5:30:00 PM MANBRIN_RIVER_NB ? ?193
> 61 ?2009-10-09 5:40:00 PM MANBRIN_RIVER_NB ? ?205
> *62 ?2009-10-09 5:50:00 PM MANBRIN_RIVER_NB ?NA*
> 62 ?2009-10-09 6:00:00 PM MANBRIN_RIVER_NB ? ?185
>
>
> Thanks in advance,
> Kindra
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>

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