datetime - How do I subset data based on a date range in r? -


i have large .txt data file , need subset based on date range.

head(newfile)         date     time global_active_power global_reactive_power voltage global_intensity 1 16/12/2006 17:24:00               4.216                 0.418  234.84             18.4 2 16/12/2006 17:25:00               5.360                 0.436  233.63             23.0 3 16/12/2006 17:26:00               5.374                 0.498  233.29             23.0 4 16/12/2006 17:27:00               5.388                 0.502  233.74             23.0 5 16/12/2006 17:28:00               3.666                 0.528  235.68             15.8 6 16/12/2006 17:29:00               3.520                 0.522  235.02             15.0   sub_metering_1 sub_metering_2 sub_metering_3 1              0              1             17 2              0              1             16 3              0              2             17 4              0              1             17 5              0              1             17 6              0              2             17

i need use data dates 2007-02-01 , 2007-02-02.

i think need convert date , time variables date/time classes in r using strptime() , as.date() functions, i'm not clear on how that.

what simplest/cleanest way this?

you can use lubridate library, code example, make little change data

library(lubridate)  > df <- read.table("test2.txt", header=true) > df         date     time global_active_power global_reactive_power voltage 1 16/12/2006 17:24:00               4.216                 0.418  234.84 2 16/12/2006 17:25:00               5.360                 0.436  233.63 3 16/12/2007 17:26:00               5.374                 0.498  233.29 4 16/12/2007 17:27:00               5.388                 0.502  233.74 5 16/12/2006 17:28:00               3.666                 0.528  235.68   global_intensity 1             18.4 2             23.0 3             23.0 4             23.0 5             15.8 > date1 = dmy("04/06/2007") > date2 = dmy("04/06/2009") > with( df , df[ dmy(df$date) >= date1 ,dmy(df$date) <= date2 ] )         date     time global_active_power global_reactive_power voltage 3 16/12/2007 17:26:00               5.374                 0.498  233.29 4 16/12/2007 17:27:00               5.388                 0.502  233.74   global_intensity 3               23 4               23 >

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