Re: [R] Handling Time in R
Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex From: jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000 10.000 6.000 16.000 23.000 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex [[alternative HTML version deleted]] __ R-help@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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Handling Time in R
check the help page; there is a parameter ('units' I thnk) that will let you
specify that.
Sent from my iPad
On Oct 10, 2011, at 2:57, Alaios ala...@yahoo.com wrote:
Thanks a lot.
That helped.
One thing now is to have the difftime(y,x) to always report seconds. There
are times that there is a change in the day and thus the diff will report few
days difference. How can it always report only seconds?
I would like to thank you in advance for your help
B.R
Alex
From: jim holtman jholt...@gmail.com
To: Alaios ala...@yahoo.com
Cc: R-help@r-project.org R-help@r-project.org
Sent: Friday, October 7, 2011 5:34 PM
Subject: Re: [R] Handling Time in R
?ISOdatetime
x - ISOdatetime(2011,10,6,16,23,30.539)
str(x)
POSIXct[1:1], format: 2011-10-06 16:23:30
y - ISOdatetime(2011,10,6,16,23,30.939)
difftime(y,x)
Time difference of 0.399 secs
On Fri, Oct 7, 2011 at 11:04 AM, Alaios ala...@yahoo.com wrote:
Dear all,
I would like to ask your help regarding handling time stamps in R. I think
first I need a reference to read about their logic and how I should handle
them.
For example, this is a struct I have
str(MyStruct$TimeStamps)
num [1:100, 1:6] 2011 2011 2011 2011 2011 ...
MyStruct$TimeStamps[1,]
[1] 2011.000 10.0006.000 16.000 23.000 30.539
the last field contains seconds.milliseconds.
How I can for example make calculations with time stamps like see if the
MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than
300millisecond, or 3 days have passed?
I would like to thank you in advance for your suggestions
B.R
Alex
[[alternative HTML version deleted]]
__
R-help@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.
--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
[[alternative HTML version deleted]]
__
R-help@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.
Re: [R] Handling Time in R
This did the trick
as.numeric(diff(c(ISOdatetime(2011,6,1,11,59,1.09),ISOdatetime(2011,6,5,11,59,1.09
[1] 345600
From: Jim Holtman jholt...@gmail.com
Cc: R-help@r-project.org R-help@r-project.org
Sent: Monday, October 10, 2011 9:26 AM
Subject: Re: [R] Handling Time in R
check the help page; there is a parameter ('units' I thnk) that will let you
specify that.
Sent from my iPad
Thanks a lot.
That helped.
One thing now is to have the difftime(y,x) to always report seconds. There are
times that there is a change in the day and thus the diff will report few days
difference. How can it always report only seconds?
I would like to thank you in advance for your help
B.R
Alex
From: jim holtman jholt...@gmail.com
Cc: R-help@r-project.org R-help@r-project.org
Sent: Friday, October 7, 2011 5:34 PM
Subject: Re: [R] Handling Time in R
?ISOdatetime
x - ISOdatetime(2011,10,6,16,23,30.539)
str(x)
POSIXct[1:1], format: 2011-10-06 16:23:30
y - ISOdatetime(2011,10,6,16,23,30.939)
difftime(y,x)
Time difference of 0.399 secs
Dear all,
I would like to ask your help regarding handling time stamps in R. I think
first I need a reference to read about their logic and how I should handle
them.
For example, this is a struct I have
str(MyStruct$TimeStamps)
num [1:100, 1:6] 2011 2011 2011 2011 2011 ...
MyStruct$TimeStamps[1,]
[1] 2011.000 10.000 6.000 16.000 23.000 30.539
the last field contains
seconds.milliseconds.
How I can for example make calculations with time stamps like see if the
MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than
300millisecond, or 3 days have passed?
I would like to thank you in advance for your suggestions
B.R
Alex
[[alternative HTML version deleted]]
__
R-help@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.
--
Jim Holtman
Data Munger
Guru
What is the problem that you are trying to solve?
[[alternative HTML version deleted]]
__
R-help@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.
Re: [R] Handling Time in R
Difftime doesn't report things. When you print it, it automatically selects an appropriate human-readable unit to display in, but that does not change its internal representation. If you must convert to seconds, you can do so using the as.double generic (as.double.difftime) with a units parameter. --- Jeff Newmiller The . . Go Live... DCN:jdnew...@dcn.davis.ca.us Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Alaios ala...@yahoo.com wrote: Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex _ From: jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) �num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000�� 10.000��� 6.000�� 16.000�� 23.000�� 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex � � � �[[alternative HTML version deleted]] _ R-help@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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] _ R-help@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. [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Handling Time in R
Do you mean something like that? as.double(diff(c(ISOdatetime(2011,6,1,11,59,1.09),ISOdatetime(2011,6,5,11,59,1.09))),length=20) [1] 345600 From: Jeff Newmiller jdnew...@dcn.davis.ca.us Cc: R-help@r-project.org R-help@r-project.org Sent: Monday, October 10, 2011 10:42 AM Subject: Re: [R] Handling Time in R Difftime doesn't report things. When you print it, it automatically selects an appropriate human-readable unit to display in, but that does not change its internal representation. If you must convert to seconds, you can do so using the as.double generic (as.double.difftime) with a units parameter. --- Jeff NewmillerThe . . Go Live... DCN:jdnew...@dcn.davis.ca.usBasics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/BatteriesO.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex From: jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) �num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000�� 10.000��� 6.000�� 16.000�� 23.000�� 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex � � � �[[alternative HTML version deleted]] R-help@r-project.org mailing list br / 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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] R-help@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. [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Handling Time in R
No, read ?difftime and look at as.double. There is a units parameter that you must set if you want predictable results. --- Jeff Newmiller The . . Go Live... DCN:jdnew...@dcn.davis.ca.us Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Alaios ala...@yahoo.com wrote: Do you mean something like that? as.double(diff(c(ISOdatetime(2011,6,1,11,59,1.09),ISOdatetime(2011,6,5,11,59,1.09))),length=20) [1] 345600 _ From: Jeff Newmiller jdnew...@dcn.davis.ca.us To: Alaios ala...@yahoo.com; jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Monday, October 10, 2011 10:42 AM Subject: Re: [R] Handling Time in R Difftime doesn't report things. When you print it, it automatically selects an appropriate human-readable unit to display in, but that does not change its internal representation. If you must convert to seconds, you can do so using the as.double generic (as.double.difftime) with a units parameter. --- Jeff Newmiller The . . Go Live... DCN:jdnew...@dcn.davis.ca.us Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Alaios ala...@yahoo.com wrote: Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex _ From: jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) �num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000�� 10.000��� 6.000�� 16.000�� 23.000�� 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex � � � �[[alternative HTML version deleted]] _ R-help@r-project.org mailing list br / 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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] _ R-help@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. [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Handling Time in R
Thanks a lot for your answer. It is something that I do not understand with R how the wrapper functions work really. As an example, check the code below  TimeDiffInSeconds-diff((ISOdate(timeMatrix[,1],timeMatrix[,2],timeMatrix[,3],timeMatrix[,4],timeMatrix[,5],timeMatrix[,6])),units=secs);       returns an error even though I make it   TimeDiffInSeconds-difftime((ISOdate(timeMatrix[,1],timeMatrix[,2],timeMatrix[,3],timeMatrix[,4],timeMatrix[,5],timeMatrix[,6])),units=secs);       I would like to thank you in advance for your help B.R Alex From: Jeff Newmiller jdnew...@dcn.davis.ca.us Cc: R-help@r-project.org R-help@r-project.org Sent: Monday, October 10, 2011 12:23 PM Subject: Re: [R] Handling Time in R No, read ?difftime and look at as.double. There is a units parameter that you must set if you want predictable results. --- Jeff NewmillerThe . . Go Live... DCN:jdnew...@dcn.davis.ca.usBasics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/BatteriesO.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Do you mean something like that? as.double(diff(c(ISOdatetime(2011,6,1,11,59,1.09),ISOdatetime(2011,6,5,11,59,1.09))),length=20) [1] 345600 From: Jeff Newmiller jdnew...@dcn.davis.ca.us Cc: R-help@r-project.org R-help@r-project.org Sent: Monday, October 10, 2011 10:42 AM Subject: Re: [R] Handling Time in R Difftime doesn't report things. When you print it, it automatically selects an appropriate human-readable unit to display in, but that does not change its internal representation. If you must convert to seconds, you can do so using the as.double generic (as.double.difftime) with a units parameter. --- Jeff NewmillerThe . . Go Live... DCN:jdnew...@dcn.davis.ca.usBasics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/BatteriesO.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --- Sent from my phone. Please excuse my brevity. Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex From: jim holtman jholt...@gmail.com Cc: R-help@r-project.org R-help@r-project.org Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) �num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000�� 10.000��� 6.000�� 16.000�� 23.000�� 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex � � � �[[alternative HTML version deleted]] R-help@r-project.org mailing list br / 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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] R-help@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. [[alternative HTML version deleted]] __ R-help@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
Re: [R] Handling Time in R
?ISOdatetime x - ISOdatetime(2011,10,6,16,23,30.539) str(x) POSIXct[1:1], format: 2011-10-06 16:23:30 y - ISOdatetime(2011,10,6,16,23,30.939) difftime(y,x) Time difference of 0.399 secs On Fri, Oct 7, 2011 at 11:04 AM, Alaios ala...@yahoo.com wrote: Dear all, I would like to ask your help regarding handling time stamps in R. I think first I need a reference to read about their logic and how I should handle them. For example, this is a struct I have str(MyStruct$TimeStamps) num [1:100, 1:6] 2011 2011 2011 2011 2011 ... MyStruct$TimeStamps[1,] [1] 2011.000 10.000 6.000 16.000 23.000 30.539 the last field contains seconds.milliseconds. How I can for example make calculations with time stamps like see if the MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than 300millisecond, or 3 days have passed? I would like to thank you in advance for your suggestions B.R Alex [[alternative HTML version deleted]] __ R-help@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. -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? __ R-help@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.
