A data frame containing the number of ids for each track value.
Arguments
ids
track name or Ids Table
tracks
a vector of track names
stime
start time scope
etime
end time scope
filter
iterator filter
Details
This function accepts a set of ids and a vector of categorical tracks. For
each track value it calculates how many ids share this value. Each id is
counted only once. A data frame with 3 columns 'track', 'val' and 'count' is
returned.
Ids can originate from a track or be provided within Ids Table.
Note: The internal iterator that runs over each track is defined with
'keepref=TRUE'.