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+ SequenceableCollection {
// Returns an array of addends to the sum.
// Useful for fitting the inter-offset times of an
// arbitrary number of notes to the length of a measure.
asAddendsOf{ arg sum;
var result, values, val;
result = this.class.new;
values = this.copy;
while({ sum > 0 },{
val = values.choose;
if( val <= sum, {
result = result.add(val);
sum = sum - val;
}, {
// value can't be used anymore
values.remove(val);
// if there are no more usable values, exit loop
if( values.size == 0, {
sum = -1;
});
});
});
^result
}
// same as asSummationOf, but with weights
aswAddendsOf{ arg summation, weights;
var result, values, index;
result = this.class.new;
values = this.copy;
weights = weights.normalizeSum;
while({ summation > 0 },{
index = Array.series(values.size, 0, 1).wchoose(weights);
if( values[index] <= summation, {
result = result.add(values[index]);
summation = summation - values[index];
}, {
// value can't be used anymore
values.removeAt(index);
weights.removeAt(index);
weights = weights.normalizeSum;
// if there are no more usable values, exit loop
if( values.size == 0, {
summation = -1;
});
});
});
^result
}
}
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