New in version 1.1.
Join subsequences in sequence by sign:
abjad> from abjad.tools import sequencetools
abjad> sequence = [[1, 2], [3, 4], [-5, -6, -7], [-8, -9, -10], [11, 12]]
abjad> sequencetools.join_subsequences_by_sign_of_subsequence_elements(sequence)
[[1, 2, 3, 4], [-5, -6, -7, -8, -9, -10], [11, 12]]
abjad> sequence = [[1, 2], [], [], [3, 4, 5], [6, 7]]
abjad> sequencetools.join_subsequences_by_sign_of_subsequence_elements(sequence)
[[1, 2], [], [3, 4, 5, 6, 7]]
Return newly constructed list.
Changed in version 2.0: renamed sequencetools.join_sublists_by_sign() to sequencetools.join_subsequences_by_sign_of_subsequence_elements().