New in version 1.1..
Increase sequence cyclically by addenda:
abjad> from abjad.tools import sequencetools
abjad> sequencetools.increase_sequence_elements_cyclically_by_addenda(range(10), [10, -10], shield = False)
[10, -9, 12, -7, 14, -5, 16, -3, 18, -1]
Increase sequence cyclically by addenda and map nonpositive values to 1:
abjad> sequencetools.increase_sequence_elements_cyclically_by_addenda(range(10), [10, -10], shield = True)
[10, 1, 12, 1, 14, 1, 16, 1, 18, 1]
Return list.
Changed in version 2.0: renamed sequencetools.increase_cyclic() to sequencetools.increase_sequence_elements_cyclically_by_addenda().