listtools.increase_at_indices — Abjad v1.1.1 documentation

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# 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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