The trick is to realize times are stored internally in a special format,
though they can be displayed in several ways based on the internal
representation. The trick in doing comparison with times is to make certain
what you are comparing with has also been put into the same internal time
format. This should make clear the basis for the logical tests:
> as.numeric(test)
[1] 34200 36000 37800 39600
>
> as.numeric(hm("10:00"))
[1] 36000
>
-Roy
> On Jan 2, 2017, at 12:39 PM, Joe Ceradini <joecerad...@gmail.com> wrote:
>
> Bingo! Thanks! I somehow couldn't find an example like that via google.
>
> Joe
>
> On Mon, Jan 2, 2017 at 1:35 PM, Roy Mendelssohn - NOAA Federal
> <roy.mendelss...@noaa.gov> wrote:
>>> test > hm("10:00")
>> [1] FALSE FALSE TRUE TRUE
>>> test[test > hm("10:00")]
>> [1] "10H 30M 0S" "11H 0M 0S"
>>
>> -Roy
>>
>>
>>> On Jan 2, 2017, at 12:27 PM, Joe Ceradini <joecerad...@gmail.com> wrote:
>>>
>>> Thanks for the reply Roy!
>>>
>>> Perhaps you're showing me the way and I'm missing it - how would I
>>> subset to only 1030 and 1100, excluding 1000? It seems I would need to
>>> say, give me all time greater than 10:00, but the hours and minutes
>>> are in separate slots, which is throwing me off.
>>>
>>> Thanks again.
>>>
>>> On Mon, Jan 2, 2017 at 1:13 PM, Roy Mendelssohn - NOAA Federal
>>> <roy.mendelss...@noaa.gov> wrote:
>>>> Hi Joe:
>>>>
>>>> See below.
>>>>> On Jan 2, 2017, at 12:01 PM, Joe Ceradini <joecerad...@gmail.com> wrote:
>>>>>
>>>>> Hi folks,
>>>>>
>>>>> I must be missing something obvious/painfully simple here....
>>>>>
>>>>> How do I subset a time vector based on hours AND minutes? So, in this
>>>>> example, I want all time greater than 10:00, i.e., 10:30 and 11:00.
>>>>> I'm working with lubridate which separates the hours and minutes into
>>>>> separate slots.
>>>>>
>>>>> require(lubridate)
>>>>>
>>>>> test <- hm(c("9:30", "10:00", "10:30", "11:00"))
>>>>> test
>>>>> [1] "9H 30M 0S" "10H 0M 0S" "10H 30M 0S" "11H 0M 0S"
>>>>>
>>>>> This gets 11 but not 1030
>>>>> test[test@hour > 10]
>>>>> [1] "11H 0M 0S"
>>>>>
>>>>> This gets 1030 but not 11
>>>>> test[test@hour > 9 & test@minute > 0]
>>>>> [1] "10H 30M 0S"
>>>>
>>>> test[test@hour > 9]
>>>> [1] "10H 0M 0S" "10H 30M 0S" "11H 0M 0S"
>>>>
>>>>
>>>> You are using a logical "and" in your test - so the condition "test@minute
>>>> > 0" isn't met for 11:00 and therefore it doesn't show up. as both
>>>> conditions must be met You could also do:
>>>>
>>>>> test[test@hour >= 10]
>>>> [1] "10H 0M 0S" "10H 30M 0S" "11H 0M 0S"
>>>>
>>>> -HTH,
>>>>
>>>> Roy
>>>>
>>>>>
>>>>> Thanks and happy new year!
>>>>> Joe
>>>>>
>>>>> ______________________________________________
>>>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>>>> 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.
>>>>
>>>> **********************
>>>> "The contents of this message do not reflect any position of the U.S.
>>>> Government or NOAA."
>>>> **********************
>>>> Roy Mendelssohn
>>>> Supervisory Operations Research Analyst
>>>> NOAA/NMFS
>>>> Environmental Research Division
>>>> Southwest Fisheries Science Center
>>>> ***Note new street address***
>>>> 110 McAllister Way
>>>> Santa Cruz, CA 95060
>>>> Phone: (831)-420-3666
>>>> Fax: (831) 420-3980
>>>> e-mail: roy.mendelss...@noaa.gov www: http://www.pfeg.noaa.gov/
>>>>
>>>> "Old age and treachery will overcome youth and skill."
>>>> "From those who have been given much, much will be expected"
>>>> "the arc of the moral universe is long, but it bends toward justice" -MLK
>>>> Jr.
>>>>
>>>
>>>
>>>
>>> --
>>> Cooperative Fish and Wildlife Research Unit
>>> Zoology and Physiology Dept.
>>> University of Wyoming
>>> joecerad...@gmail.com / 914.707.8506
>>> wyocoopunit.org
>>
>> **********************
>> "The contents of this message do not reflect any position of the U.S.
>> Government or NOAA."
>> **********************
>> Roy Mendelssohn
>> Supervisory Operations Research Analyst
>> NOAA/NMFS
>> Environmental Research Division
>> Southwest Fisheries Science Center
>> ***Note new street address***
>> 110 McAllister Way
>> Santa Cruz, CA 95060
>> Phone: (831)-420-3666
>> Fax: (831) 420-3980
>> e-mail: roy.mendelss...@noaa.gov www: http://www.pfeg.noaa.gov/
>>
>> "Old age and treachery will overcome youth and skill."
>> "From those who have been given much, much will be expected"
>> "the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
>>
>
>
>
> --
> Cooperative Fish and Wildlife Research Unit
> Zoology and Physiology Dept.
> University of Wyoming
> joecerad...@gmail.com / 914.707.8506
> wyocoopunit.org
**********************
"The contents of this message do not reflect any position of the U.S.
Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
***Note new street address***
110 McAllister Way
Santa Cruz, CA 95060
Phone: (831)-420-3666
Fax: (831) 420-3980
e-mail: roy.mendelss...@noaa.gov www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
"the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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