intervalData: Extract auxiliary tag data

In SWotherspoon/BAStag: Basic data processing for light based geolocation archival tags

Description

Summarise auxiliary data in specified intervals

Usage

intervalData(
  date,
  y,
  start,
  end,
  FUN = function(y) if (all(is.na(y))) NA else mean(y, na.rm = TRUE)
)

twilightData(
  date,
  y,
  twl,
  before = 4,
  after = 4,
  FUN = function(y) if (all(is.na(y))) NA else mean(y, na.rm = TRUE)
)

Arguments

date	the sequence of sample times as POSIXct.
y	the sequence of responses.
start	the start of the time interval to summarize.
end	the end of the time interval to summarize.
FUN	summary function
twl	the sequence of estimated twilight times as POSIXct.
before	the interval (hours) before twilight to include in the interval.
after	the interval (hours) after twilight to include in the interval.

Details

Given a time series of responses and a sequence of start and end times defining time intervals spanned by the time series, intervalData computes a summary statistic for each interval. The twilightData is similar, but the time intervals are defined as a number of hours before and after a given sequence of twilight times.

Value

the data summary for each twilight.

SWotherspoon/BAStag documentation built on March 29, 2021, 2:47 a.m.