问题
hi i have data from uber :
about pick ups in NYC . im trying to add a column to the raw data, that indicates for each row, for which time interval (which is represented by a single timepoint at the beginning of thetime interval) it belongs.
i want to Create a vector containing all relevant timepoints (i.e. every 15 minutes Use int_diff function from lubridate package on this vector to create an interval object. Run a loop on all the time points in the raw data and for each data point; indicate to which interval (which is represented by a single timepoint at the beginning of the time interval) it belongs.
i tried looking for explanations how to use the int_diff function but i dont understand how my vector should look and how the syntax of int_diff works tanks for the help :)
回答1:
Is this what you have in mind?
start <- mdy_hm('4/11/2014 0:00') # start of the period
end <- mdy_hm('5/12/2015 0:00') # end
time_seq <- seq(from = start, to = end, by = '15 mins') # sequence by 15 minutes
times <- mdy_hm(c('4/11/2014 0:12', '4/11/2014 1:24')) # times to find intervals for
dat <- data.frame(times)
dat$intervals <- cut(times, breaks = time_seq) # assign each time to an interval
intervals_cols <- model.matrix(~ - + intervals, dat) # turn this into a set of columns, one for each interval, with a 1 indicating that this observation falls into the column
来源：https://stackoverflow.com/questions/54066057/creating-inteval-object-in-r-using-lubridate-package