collapse_tiers: collapse overlapping annotations
In gobbios/avutils: various utilities for DiViMe tools and audio processing

Description Usage Arguments Details Value Examples

from overlapping tiers

1 2	collapse_tiers(xdata, timecols = c("start", "end"), ignore_tiers = NULL, ignore_annos = NULL)

`xdata`	data.frame, the data object with annotations (e.g. import from ELAN or .rttm file)
`timecols`	character, the column names for start and end of the annotations (default is `c("start", "end")`).
`ignore_tiers`	character, at least of length 2, where the first item is the column name for the tiers, and subsequently lists all tier names that should be ignored
`ignore_annos`	character, at least of length 2, where the first item is the column name for the annotations, and subsequently lists all annotation values that should be ignored

this is a fairly inefficient function (=slow)

Also, in the process annotations are re-ordered such that start time increases.

a matrix with two columns for the start and end times of (collapsed) annotations

annos <- LETTERS[1:5]
start <- c(14, 17, 45, 65, 70)
end <- c(25, 23, 60, 80, 82)
duration <- end - start
xdata <- data.frame(start, end, duration, annos)
# second anno is merged into first because it's completely comprised in the first
# last two annos are 'combined' into one
collapse_tiers(xdata = xdata, timecols = c("start", "end"))