getFrequency: Calculates dominant sampling frequency from a list of times

In allisonglider/seabiRds: Prepares biologging data for analysis and upload to the lab database

Calculates dominant sampling frequency from a list of times

Description

Calculates dominant sampling frequency from a list of times

Usage

getFrequency(time)

Arguments

time	vector of POSIXct time values

Details

This function calculates the time difference between consecutive values and returns the mode of those differences in Hz. If your sampling frequency was >1 Hz, make sure that the POSIXct vector was formatted to include miliseconds. This can be done using the %OS conversion specification instead of %S, see ?strptime. When working with data at > 1Hz, it is also useful to set options(digits.secs = 6), so that your times will print with miliseconds in R.

Examples

options(digits.secs = 6)
myTimes <- c("2019-07-16 17:43:52.04","2019-07-16 17:43:52.08",
"2019-07-16 17:43:52.12", "2019-07-16 17:43:52.16", "2019-07-16 17:43:52.20",
"2019-07-16 17:43:52.24","2019-07-16 17:43:52.28")
myTimes <- as.POSIXct(strptime(myTimes, '%Y-%m-%d %H:%M:%OS', tz = 'UTC'))
print(myTimes)
getFrequency(myTimes)

allisonglider/seabiRds documentation built on Feb. 14, 2025, 7:37 a.m.