[R] Change data frame to time series data

Wed Oct 2 17:39:22 CEST 2024

Às 16:20 de 02/10/2024, roslinazairimah zakaria escreveu:
> Let say, this is my data and I want to extract from 2014-01-01
> 00:00:00 to 2014-01-01
> 16:30:00
> 
>> dput(head(dt_ts,1000))
> 
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> 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), class = c("xts",
> "zoo"), index = structure(c(1388505600, 1388505660, 1388505720,
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> 1388559060, 1388559120, 1388559180, 1388559240, 1388559300, 1388559360,
> 1388559420, 1388559480, 1388559540, 1388559600, 1388559660, 1388559720,
> 1388559780, 1388559840, 1388559900, 1388559960, 1388560020, 1388560080,
> 1388560140, 1388560200, 1388560260, 1388560320, 1388560380, 1388560440,
> 1388560500, 1388560560, 1388560620, 1388560680, 1388560740, 1388560800,
> 1388560860, 1388560920, 1388560980, 1388561040, 1388561100, 1388561160,
> 1388561220, 1388561280, 1388561340, 1388561400, 1388561460, 1388561520,
> 1388561580, 1388561640, 1388561700, 1388561760, 1388561820, 1388561880,
> 1388561940, 1388562000, 1388562060, 1388562120, 1388562180, 1388562240,
> 1388562300, 1388562360, 1388562420, 1388562480, 1388562540, 1388562600,
> 1388562660, 1388562720, 1388562780, 1388562840, 1388562900, 1388562960,
> 1388563020, 1388563080, 1388563140, 1388563200, 1388563260, 1388563320,
> 1388563380, 1388563440, 1388563500, 1388563560, 1388563620, 1388563680,
> 1388563740, 1388563800, 1388563860, 1388563920, 1388563980, 1388564040,
> 1388564100, 1388564160, 1388564220, 1388564280, 1388564340, 1388564400,
> 1388564460, 1388564520, 1388564580, 1388564640, 1388564700, 1388564760,
> 1388564820, 1388564880, 1388564940, 1388565000, 1388565060, 1388565120,
> 1388565180, 1388565240, 1388565300, 1388565360, 1388565420, 1388565480,
> 1388565540), tzone = "", tclass = c("POSIXct", "POSIXt")), dim = c(1000L,
> 1L))
> 
> 
> On Wed, Oct 2, 2024 at 11:03 PM Hasan Diwan <hasan.diwan using gmail.com> wrote:
> 
>> On Wed, 2 Oct 2024 at 07:53, roslinazairimah zakaria <roslinaump using gmail.com
>>>
>> wrote:
>>
>>> Next question, how do I delete the date from 16 December until 31
>> December
>>> 2014?
>>>
>>
>> Something like:
>> myData <- xtsObj[myData$date <  "2014-12-16" & myData$date > "2024-12-31"]
>> -- H
>>
>> --
>> OpenPGP: https://hasan.d8u.us/openpgp.asc
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>>> Sent
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>> Envoye de mon portable
>>
>>          [[alternative HTML version deleted]]
>>
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>> PLEASE do read the posting guide
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>>
> 
> 
Hello,

Use function index.

library(xts)

# extract from 2014-01-01 00:00:00
#           to 2014-01-01 16:30:00
from <- as.POSIXct("2014-01-01 00:00:00")
to <- as.POSIXct("2014-01-01 16:30:00")
i <- index(dt_ts) >= from & index(dt_ts) <= to
dt_ts[i]

Also, instead of copying&pasting the data, you can attach a file with 
extension .txt.

Hope this helps,

Rui Barradas

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