    @make_duration_map()
    @make_duration_map(start:numeric)
    @make_duration_map(start:numeric, stop:numeric)

returns a map where the duration (in beat) of the i th event of the score, is associated to i (the keys of the map are the ranks of the events). Called with no arguments, the events considered are all the events in the score.

With `start`, only the events whose position in beat is greater than `start` are considered.

If a `stop` is specified, all events must have a position in beat between `start` and `stop`.

Nota Bene: The numbering of musical events starts at `1`. Grace notes, i.e. musical event with a duration of `0`, do not appear in the map and does not count in the ranking.

For example

           NOTE C7 0 mes2
           NOTE D6 1/2
           NOTE C7 1/5
           NOTE Eb7 2/5
           NOTE G#6 1/2
           CHORD (D1 A7) 1/8 mes2_2
           NOTE C2 1/8

with this score, `@make_duration_map()` will return:

           MAP{ (1, 0.5), (2, 0.2), (3, 0.4), (4, 0.5), (5, 0.125), (6, 0.125) }

Notice the grace note `C4`which does not appear in the map.

See also score related functions: @make_bpm_map, @make_bpm_tab, @make_duration_map, @make_duration_tab, @make_label_bpm, @make_label_duration, @make_label_pitches, @make_label_pos, @make_pitch_tab, @make_score_map @score_tempi

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