def __getitem__(self, argument):
r'''Gets item in scale.
Returns pitch-class segment.
'''
segment = PitchClassSegment(self)
return segment.__getitem__(argument)
def __getslice__(self, start, stop):
r'''Gets items from `start` to `stop` in twelve-tone row.
Returns pitch-class segment.
'''
from abjad.tools import pitchtools
items = self._collection[start:stop]
return PitchClassSegment(
items=items,
item_class=pitchtools.NumberedPitchClass,
)
def __rmul__(self, expr):
r'''Multiplies `expr` by twelve-tone row.
Returns pitch-class segment.
'''
return PitchClassSegment(self) * expr
def __rmul__(self, argument):
r'''Multiplies `argument` by row.
.. container:: example
Multiplies integer by row:
>>> row = abjad.TwelveToneRow()
>>> abjad.show(row) # doctest: +SKIP
>>> segment = row * 2
>>> abjad.show(segment) # doctest: +SKIP
.. docs::
>>> lilypond_file = segment.__illustrate__()
>>> abjad.f(lilypond_file[abjad.Voice])
\new Voice
{
c'8
cs'8
d'8
ef'8
e'8
f'8
fs'8
g'8
af'8
a'8
bf'8
b'8
c'8
cs'8
d'8
ef'8
e'8
f'8
fs'8
g'8
af'8
a'8
bf'8
b'8
\bar "|." %! SCORE1
\override Score.BarLine.transparent = ##f
}
.. container:: example
Multiplies integer by row:
>>> numbers = [1, 11, 9, 3, 6, 7, 5, 4, 10, 2, 8, 0]
>>> row = abjad.TwelveToneRow(numbers)
>>> abjad.show(row) # doctest: +SKIP
>>> segment = row * 2
>>> abjad.show(segment) # doctest: +SKIP
.. docs::
>>> lilypond_file = segment.__illustrate__()
>>> abjad.f(lilypond_file[abjad.Voice])
\new Voice
{
cs'8
b'8
a'8
ef'8
fs'8
g'8
f'8
e'8
bf'8
d'8
af'8
c'8
cs'8
b'8
a'8
ef'8
fs'8
g'8
f'8
e'8
bf'8
d'8
af'8
c'8
\bar "|." %! SCORE1
\override Score.BarLine.transparent = ##f
}
.. container:: example
Returns pitch-class segment:
>>> segment
PitchClassSegment([1, 11, 9, 3, 6, 7, 5, 4, 10, 2, 8, 0, 1, 11, 9, 3, 6, 7, 5, 4, 10, 2, 8, 0])
'''
return PitchClassSegment(self) * argument
def __getitem__(self, argument):
r'''Gets item or slice identified by `argument`.
.. container:: example
Example row:
>>> numbers = [1, 11, 9, 3, 6, 7, 5, 4, 10, 2, 8, 0]
>>> row = abjad.TwelveToneRow(numbers)
>>> abjad.show(row) # doctest: +SKIP
.. container:: example
Gets first hexachord:
>>> abjad.show(row[:6]) # doctest: +SKIP
PitchClassSegment([0, 1, 11, 9, 3, 6])
.. docs::
>>> lilypond_file = row[:6].__illustrate__()
>>> abjad.f(lilypond_file[abjad.Voice])
\new Voice
{
cs'8
b'8
a'8
ef'8
fs'8
g'8
\bar "|." %! SCORE1
\override Score.BarLine.transparent = ##f
}
.. container:: example
Gets second hexachord:
>>> abjad.show(row[-6:]) # doctest: +SKIP
.. docs::
>>> lilypond_file = row[-6:].__illustrate__()
>>> abjad.f(lilypond_file[abjad.Voice])
\new Voice
{
f'8
e'8
bf'8
d'8
af'8
c'8
\bar "|." %! SCORE1
\override Score.BarLine.transparent = ##f
}
.. container:: example
Returns pitch-class segment:
>>> row[-6:]
PitchClassSegment([5, 4, 10, 2, 8, 0])
'''
from abjad.tools import pitchtools
item = self._collection.__getitem__(argument)
try:
return PitchClassSegment(
items=item,
item_class=pitchtools.NumberedPitchClass,
)
except TypeError:
return item
