pub fn weighted_index(weights: &[FloatType], draw: FloatType) -> Result<usize>Expand description
Which of the weighted choices a draw draw from the unit interval
lands on, as music21’s weightedSelection picks one: the last where it
lands on none.
use music21::common::numbertools::weighted_index;
assert_eq!(weighted_index(&[1.0, 3.0], 0.2)?, 0);
assert_eq!(weighted_index(&[1.0, 3.0], 0.3)?, 1);§Errors
A negative weight.