rdataframelubridatechron

Cut integer as time into 15 minutes intervals

Time is in the format of integer, and it is without date. I tried to use package lubridate but it asks for both date and time.

I was not able to find an equivalent of seq() in package chron either.

The column looks like:

time
525
1526
756
2252
...

525 represents 5:25; 1526 represents 7:56. And I'd like to have a table that counts frequency in each 15 mins interval; intervals are 00:00-00:15, 00:16-00:30, 00:31-00:45, 00:46-00:59, ..., 23:46-23:59

Solution

  • We can convert to ITime with as.ITime from data.table

    library(data.table)
v2 <- as.ITime(sub("^(..)", "\\1:", sprintf('%04d:00', df1$time)))
table(cut(v2, breaks = 15))

    data

    df1 <- structure(list(time = c(525, 1526, 756, 2252)), class = "data.frame", row.names = c(NA, 
-4L))