[R] Lubdridate: subset based on hour and minute

[Joe Ceradini]

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.mendelssohn at 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 <joeceradini at 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.mendelssohn at noaa.gov> wrote:
>>> Hi Joe:
>>>
>>> See below.
>>>> On Jan 2, 2017, at 12:01 PM, Joe Ceradini <joeceradini at 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 at hour > 10]
>>>> [1] "11H 0M 0S"
>>>>
>>>> This gets 1030 but not 11
>>>> test[test at hour > 9 & test at minute > 0]
>>>> [1] "10H 30M 0S"
>>>
>>> test[test at 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 at 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 at hour >= 10]
>>> [1] "10H 0M 0S"  "10H 30M 0S" "11H 0M 0S"
>>>
>>> -HTH,
>>>
>>> Roy
>>>
>>>>
>>>> Thanks and happy new year!
>>>> Joe
>>>>
>>>> ______________________________________________
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>>>> 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.Mendelssohn at 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
>> JoeCeradini at 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.Mendelssohn at 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
JoeCeradini at gmail.com / 914.707.8506
wyocoopunit.org