listtools.increase_at_indices

abjad.tools.listtools.increase_at_indices(l, addenda, indices)

Increase the elements of list l by the elements of addenda at indices in l.

abjad> l = [1, 1, 2, 3, 5, 5, 1, 2, 5, 5, 6]
abjad> listtools.increase_at_indices(l, [0.5, 0.5], [0, 4, 8])
[1.5, 1.5, 2, 3, 5.5, 5.5, 1, 2, 5.5, 5.5, 6]

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