[R] Extract time and state of charge (Start and End) and Count

[@vi@e@gross m@iii@g oii gm@ii@com]

Rui,

The posted data was likely not well chosen as it has no rows that satisfy what I thought was the requirement of going from 0 to 12.

Questions here can often be written more clearly. We can all guess, but my guess was a bit like yours that he/she wanted to count how many rows there are per specific dates/hours (meaning up to 24 per day) that also satisfy a filter requirement. Of course, it is also possible that they do not care about what days, but want to know what happens any day between 9 and 10 Am and other possibilities.

It would be nice if people who asked questions followed up so we stop wasting our time answering what was not asked!



-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Rui Barradas
Sent: Monday, July 18, 2022 1:11 PM
To: roslinazairimah zakaria <roslinaump using gmail.com>; R help Mailing list <r-help using r-project.org>
Subject: Re: [R] Extract time and state of charge (Start and End) and Count

Hello,

I'm not sure I understand the problem. Do you want counts of how many rows are there per hour?


# these columns need to be fixed
cols <- c("BatteryChargeStartDate", "BatteryChargeStopDate")
dt_2014[cols] <- lapply(dt_2014[cols], \(x) sub("\n", " ", x))
# use package lubridate to coerce to a datetime class
dt_2014[cols] <- lapply(dt_2014[cols], lubridate::dmy_hm)

h <- lubridate::hour(dt_2014[["BatteryChargeStartDate"]])
aggregate(Starting_SoC_of_12 ~ h, dt_2014, length)



It would be better if you post the expected output corresponding to the 
posted data set.

Hope this helps,

Rui Barradas

Às 05:04 de 18/07/2022, roslinazairimah zakaria escreveu:
> Dear all,
> 
> I have data of Battery Electric vehicle (BEV). I would like to extract data
> from every hour starting from 0.00 to 0.59, 1:00-1:59 for SOC(state of
> charge) start to end.
> 
> Some examples:
> I can extract data from SOC=0 and SOC=12
> dt_2014[which(dt_2014$Starting_SoC_of_12==0 &
> dt_2014$Ending_SoC_of_12==12),]
> 
> I can extract data from SOC=1 and SOC=12
> dt_2014[which(dt_2014$Starting_SoC_of_12==1 &
> dt_2014$Ending_SoC_of_12==12),]
> 
> and I would like to further categorise the data by hour and count how many
> cars from 0 state charge to 12 state charge at in that particular hour.
> 
> Thank you so much for any help given.
> 
> Some data
>> dput(dt_2014[1:10,])
> structure(list(ï..CarID = c("GC10", "GC10", "GC10", "GC10", "GC10",
> "GC10", "GC10", "GC10", "GC10", "GC10"), BatteryChargeStartDate =
> c("16/2/2014 16:05",
> "16/2/2014 18:20", "17/2/2014 8:10", "18/2/2014 7:41", "18/2/2014 15:36",
> "18/2/2014 16:36", "18/2/2014 21:26", "19/2/2014 8:57", "19/2/2014 21:08",
> "20/2/2014 18:11"), BCStartTime = c("16:05", "18:20", "8:10",
> "7:41", "15:36", "16:36", "21:26", "8:57", "21:08", "18:11"),
>      Year = c(2014L, 2014L, 2014L, 2014L, 2014L, 2014L, 2014L,
>      2014L, 2014L, 2014L), Month = c(2L, 2L, 2L, 2L, 2L, 2L, 2L,
>      2L, 2L, 2L), Day = c(16L, 16L, 17L, 18L, 18L, 18L, 18L, 19L,
>      19L, 20L), BatteryChargeStopDate = c("16/2/2014 17:05", "16/2/2014
> 19:00",
>      "17/2/2014 15:57", "18/2/2014 9:52", "18/2/2014 15:39", "18/2/2014
> 17:36",
>      "19/2/2014 1:55", "19/2/2014 14:25", "20/2/2014 5:17", "20/2/2014 23:20"
>      ), BCStopTime = c("17:05", "19:00", "15:57", "9:52", "15:39",
>      "17:36", "1:55", "14:25", "5:17", "23:20"), Year2 = c(2014L,
>      2014L, 2014L, 2014L, 2014L, 2014L, 2014L, 2014L, 2014L, 2014L
>      ), Month2 = c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), Day2 = c(16L,
>      16L, 17L, 18L, 18L, 18L, 19L, 19L, 20L, 20L), Starting_SoC_of_12 =
> c(1L,
>      2L, 4L, 5L, 4L, 2L, 8L, 8L, 4L, 8L), Ending_SoC_of_12 = c(11L,
>      11L, 12L, 8L, 4L, 10L, 12L, 12L, 12L, 12L)), row.names = c(NA,
> 10L), class = "data.frame")
> 
>

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