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Table Of Contents

Table Of Contents

music21.graph

Object definitions for graphing and plotting Stream objects. The Graph object subclasses abstract fundamental graphing archetypes using the matplotlib library. The Plot object subclasses provide reusable approaches to graphing data and structures in Stream objects.

music21.graph.getColor(color)

Convert any specification of a color to a hexadecimal color used by matplotlib.

>>> from music21 import *
>>> graph.getColor('red')
'#ff0000'
>>> graph.getColor('Steel Blue')
'#4682b4'
>>> graph.getColor('#f50')
'#ff5500'
>>> graph.getColor([.5, .5, .5])
'#808080'
>>> graph.getColor(.8)
'#cccccc'
>>> graph.getColor([255, 255, 255])
'#ffffff'
music21.graph.plotStream(streamObj, *args, **keywords)

Given a stream and any keyword configuration arguments, create and display a plot.

Note: plots requires matplotib to be installed.

Plot methods can be specified as additional arguments or by keyword. Two keyword arguments can be given: format and values. If positional arguments are given, the first is taken as format and the rest are collected as values. If format is the class name, that class is collected. Additionally, every PlotStream subclass defines one format string and a list of values strings. The format parameter defines the type of Graph (e.g. scatter, histogram, colorGrid). The values list defines what values are graphed (e.g. quarterLength, pitch, pitchClass).

If a user provides a format and one or more values strings, a plot with the corresponding profile, if found, will be generated. If not, the first Plot to match any of the defined specifiers will be created.

In the case of PlotWindowedAnalysis subclasses, the DiscreteAnalysis subclass indentifiers list is added to the Plot’s values list.

Available plots include the following:

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> s.plot('histogram', 'pitch')
_images/PlotHistogramPitchSpace.png
>>> s = corpus.parse('bach/bwv57.8')
>>> s.plot('pianoroll')
_images/PlotHorizontalBarPitchSpaceOffset.png
music21.graph.userFormatsToFormat(value)

Replace possible user format strings with defined format names as used herein. Returns string unaltered if no match.

music21.graph.userValuesToValues(valueList)

Given a value list, replace string with synonymes. Let unmatched values pass.

PlotHistogramPitchSpace

Inherits from: PlotHistogram, PlotStream

class music21.graph.PlotHistogramPitchSpace(streamObj, *args, **keywords)

A histogram of pitch space.

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotHistogramPitchSpace(s)
>>> p.id
'histogram-pitch'
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotHistogramPitchSpace.png

PlotHistogramPitchSpace attributes

Attributes without Documentation: values

Attributes inherited from PlotHistogram: format

PlotHistogramPitchSpace properties

Properties inherited from PlotStream: id

PlotHistogramPitchSpace methods

PlotHistogramPitchClass

Inherits from: PlotHistogram, PlotStream

class music21.graph.PlotHistogramPitchClass(streamObj, *args, **keywords)

A histogram of pitch class

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotHistogramPitchClass(s)
>>> p.id
'histogram-pitchClass'
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotHistogramPitchClass.png

PlotHistogramPitchClass attributes

Attributes without Documentation: values

Attributes inherited from PlotHistogram: format

PlotHistogramPitchClass properties

Properties inherited from PlotStream: id

PlotHistogramPitchClass methods

PlotHistogramQuarterLength

Inherits from: PlotHistogram, PlotStream

class music21.graph.PlotHistogramQuarterLength(streamObj, *args, **keywords)

A histogram of pitch class

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotHistogramQuarterLength(s)
>>> p.id
'histogram-quarterLength'
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotHistogramQuarterLength.png

PlotHistogramQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from PlotHistogram: format

PlotHistogramQuarterLength properties

Properties inherited from PlotStream: id

PlotHistogramQuarterLength methods

PlotWindowedKrumhanslSchmuckler

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedKrumhanslSchmuckler(streamObj, *args, **keywords)

Stream plotting of windowed version of Krumhansl-Schmuckler analysis routine. See KrumhanslSchmuckler for more details.

>>> from music21 import *
>>> s = corpus.parse('bach/bwv66.6')
>>> p = graph.PlotWindowedKrumhanslSchmuckler(s.parts[0])
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotWindowedKrumhanslSchmuckler.png _images/legend-PlotWindowedKrumhanslSchmuckler.png

PlotWindowedKrumhanslSchmuckler attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedKrumhanslSchmuckler properties

Properties inherited from PlotStream: id

PlotWindowedKrumhanslSchmuckler methods

PlotWindowedAmbitus

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedAmbitus(streamObj, *args, **keywords)

Stream plotting of basic pitch span.

>>> from music21 import *
>>> s = corpus.parse('bach/bwv66.6')
>>> p = graph.PlotWindowedAmbitus(s.parts[0])
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotWindowedAmbitus.png _images/legend-PlotWindowedAmbitus.png

PlotWindowedAmbitus attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedAmbitus properties

Properties inherited from PlotStream: id

PlotWindowedAmbitus methods

PlotScatterPitchSpaceQuarterLength

Inherits from: PlotScatter, PlotStream

class music21.graph.PlotScatterPitchSpaceQuarterLength(streamObj, *args, **keywords)

A scatter plot of pitch space and quarter length

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotScatterPitchSpaceQuarterLength(s)
>>> p.id
'scatter-pitch-quarterLength'
>>> p.process()
_images/PlotScatterPitchSpaceQuarterLength.png

PlotScatterPitchSpaceQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from PlotScatter: format

PlotScatterPitchSpaceQuarterLength properties

Properties inherited from PlotStream: id

PlotScatterPitchSpaceQuarterLength methods

PlotScatterPitchClassQuarterLength

Inherits from: PlotScatter, PlotStream

class music21.graph.PlotScatterPitchClassQuarterLength(streamObj, *args, **keywords)

A scatter plot of pitch class and quarter length

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotScatterPitchClassQuarterLength(s)
>>> p.id
'scatter-pitchClass-quarterLength'
>>> p.process()
_images/PlotScatterPitchClassQuarterLength.png

PlotScatterPitchClassQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from PlotScatter: format

PlotScatterPitchClassQuarterLength properties

Properties inherited from PlotStream: id

PlotScatterPitchClassQuarterLength methods

PlotScatterPitchClassOffset

Inherits from: PlotScatter, PlotStream

class music21.graph.PlotScatterPitchClassOffset(streamObj, *args, **keywords)

A scatter plot of pitch class and offset

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotScatterPitchClassOffset(s)
>>> p.id
'scatter-pitchClass-offset'
>>> p.process()
_images/PlotScatterPitchClassOffset.png

PlotScatterPitchClassOffset attributes

Attributes without Documentation: values

Attributes inherited from PlotScatter: format

PlotScatterPitchClassOffset properties

Properties inherited from PlotStream: id

PlotScatterPitchClassOffset methods

PlotScatterPitchSpaceDynamicSymbol

Inherits from: PlotScatter, PlotStream

class music21.graph.PlotScatterPitchSpaceDynamicSymbol(streamObj, *args, **keywords)

A graph of dynamics used by pitch space.

>>> from music21 import *
>>> s = corpus.parse('schumann/opus41no1', 2)
>>> p = graph.PlotScatterPitchSpaceDynamicSymbol(s)
>>> p.process()
_images/PlotScatterPitchSpaceDynamicSymbol.png

PlotScatterPitchSpaceDynamicSymbol attributes

Attributes without Documentation: values

Attributes inherited from PlotScatter: format

PlotScatterPitchSpaceDynamicSymbol properties

Properties inherited from PlotStream: id

PlotScatterPitchSpaceDynamicSymbol methods

PlotHorizontalBarPitchSpaceOffset

Inherits from: PlotHorizontalBar, PlotStream

class music21.graph.PlotHorizontalBarPitchSpaceOffset(streamObj, *args, **keywords)

A graph of events, sorted by pitch space, over time

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotHorizontalBarPitchSpaceOffset(s)
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotHorizontalBarPitchSpaceOffset.png

PlotHorizontalBarPitchSpaceOffset attributes

Attributes without Documentation: values

Attributes inherited from PlotHorizontalBar: format

PlotHorizontalBarPitchSpaceOffset properties

Properties inherited from PlotStream: id

PlotHorizontalBarPitchSpaceOffset methods

PlotHorizontalBarPitchClassOffset

Inherits from: PlotHorizontalBar, PlotStream

class music21.graph.PlotHorizontalBarPitchClassOffset(streamObj, *args, **keywords)

A graph of events, sorted by pitch class, over time

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotHorizontalBarPitchClassOffset(s)
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotHorizontalBarPitchClassOffset.png

PlotHorizontalBarPitchClassOffset attributes

Attributes without Documentation: values

Attributes inherited from PlotHorizontalBar: format

PlotHorizontalBarPitchClassOffset properties

Properties inherited from PlotStream: id

PlotHorizontalBarPitchClassOffset methods

PlotDolan

Inherits from: PlotHorizontalBarWeighted, PlotStream

class music21.graph.PlotDolan(streamObj, *args, **keywords)

A graph of the activity of a parameter of a part (or a group of parts) over time. The default parameter graphed is Dynamics. Dynamics are assumed to extend activity to the next change in dynamics.

Numerous parameters can be configured based on functionality encoded in the PartReduction object.

If the fillByMeasure parameter is True, and if measures are available, each part will segment by Measure divisions, and look for the target activity only once per Measure. If more than one target is found in the Measure, values will be averaged. If fillByMeasure is False, the part will be segmented by each Note.

The segmentByTarget parameter is True, segments, which may be Notes or Measures, will be divided if necessary to show changes that occur over the duration of the segment by a target object.

If the normalizeByPart parameter is True, each part will be normalized within the range only of that part. If False, all parts will be normalized by the max of all parts. The default is True.

>>> from music21 import *
>>> s = corpus.parse('bwv66.6')
>>> dyn = ['p', 'mf', 'f', 'ff', 'mp', 'fff', 'ppp']
>>> i = 0
... for p in s.parts:
...     for m in p.getElementsByClass('Measure'):
...         m.insert(0, dynamics.Dynamic(dyn[i % len(dyn)]))
...         i += 1
...
>>> s.plot('dolan', fillByMeasure=True, segmentByTarget=True)
_images/PlotDolan.png

PlotDolan attributes

Attributes without Documentation: values

Attributes inherited from PlotHorizontalBarWeighted: format

PlotDolan properties

Properties inherited from PlotStream: id

PlotDolan methods

PlotScatterWeightedPitchSpaceQuarterLength

Inherits from: PlotScatterWeighted, PlotStream

class music21.graph.PlotScatterWeightedPitchSpaceQuarterLength(streamObj, *args, **keywords)

A graph of event, sorted by pitch, over time

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotScatterWeightedPitchSpaceQuarterLength(s)
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotScatterWeightedPitchSpaceQuarterLength.png

PlotScatterWeightedPitchSpaceQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from PlotScatterWeighted: format

PlotScatterWeightedPitchSpaceQuarterLength properties

Properties inherited from PlotStream: id

PlotScatterWeightedPitchSpaceQuarterLength methods

PlotScatterWeightedPitchClassQuarterLength

Inherits from: PlotScatterWeighted, PlotStream

class music21.graph.PlotScatterWeightedPitchClassQuarterLength(streamObj, *args, **keywords)

A graph of event, sorted by pitch class, over time.

>>> from music21 import *
>>> s = corpus.parse('bach/bwv57.8')
>>> p = graph.PlotScatterWeightedPitchClassQuarterLength(s)
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotScatterWeightedPitchClassQuarterLength.png

PlotScatterWeightedPitchClassQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from PlotScatterWeighted: format

PlotScatterWeightedPitchClassQuarterLength properties

Properties inherited from PlotStream: id

PlotScatterWeightedPitchClassQuarterLength methods

PlotScatterWeightedPitchSpaceDynamicSymbol

Inherits from: PlotScatterWeighted, PlotStream

class music21.graph.PlotScatterWeightedPitchSpaceDynamicSymbol(streamObj, *args, **keywords)

A graph of dynamics used by pitch space.

>>> from music21 import *
>>> s = corpus.parse('schumann/opus41no1', 2)
>>> p = graph.PlotScatterWeightedPitchSpaceDynamicSymbol(s)
>>> p.process() # with defaults and proper configuration, will open graph
_images/PlotScatterWeightedPitchSpaceDynamicSymbol.png

PlotScatterWeightedPitchSpaceDynamicSymbol attributes

Attributes without Documentation: values

Attributes inherited from PlotScatterWeighted: format

PlotScatterWeightedPitchSpaceDynamicSymbol properties

Properties inherited from PlotStream: id

PlotScatterWeightedPitchSpaceDynamicSymbol methods

Plot3DBarsPitchSpaceQuarterLength

Inherits from: Plot3DBars, PlotStream

class music21.graph.Plot3DBarsPitchSpaceQuarterLength(streamObj, *args, **keywords)

A scatter plot of pitch and quarter length

>>> from music21 import *
>>> from music21.musicxml import testFiles
>>> s = converter.parse(testFiles.mozartTrioK581Excerpt)
>>> p = graph.Plot3DBarsPitchSpaceQuarterLength(s)
>>> p.id
'3dBars-pitch-quarterLength'
>>> p.process() # with defaults and proper configuration, will open graph
_images/Plot3DBarsPitchSpaceQuarterLength.png

Plot3DBarsPitchSpaceQuarterLength attributes

Attributes without Documentation: values

Attributes inherited from Plot3DBars: format

Plot3DBarsPitchSpaceQuarterLength properties

Properties inherited from PlotStream: id

Plot3DBarsPitchSpaceQuarterLength methods

Graph

class music21.graph.Graph(*args, **keywords)

A music21.graph.Graph is an object that represents a visual graph or plot, automating the creation and configuration of this graph in matplotlib. It is a low-level object that most music21 users do not need to call directly; yet, as most graphs will take keyword arguments that specify the look of graphs, they are important to know about.

The keyword arguments can be provided for configuration are: alpha (which describes how transparent elements of the graph are), colorBackgroundData, colorBackgroundFigure, colorGrid, title, doneAction (see below), figureSize, colors, tickFontSize, titleFontSize, labelFontSize, fontFamily, marker, markerSize.

Graph objects do not manipulate Streams or other music21 data; they only manipulate raw data formatted for each Graph subclass, hence it is unlikely that users will call this class directly.

The doneAction argument determines what happens after the graph has been processed. Currently there are three options, ‘write’ creates a file on disk (this is the default), while ‘show’ opens an interactive GUI browser. The third option, None, does the processing but does not write any output.

>>> from music21 import *
>>> a = graph.Graph(title='a graph of some data to be given soon', tickFontSize = 9)
>>> a.setData(['some', 'arbitrary', 'data', 14, 9.04, None])

Graph attributes

Attributes without Documentation: doneAction, hideYGrid, fontFamily, colors, axisKeys, marker, axis, title, markerSize, xTickLabelVerticalAlignment, colorGrid, titleFontSize, colorBackgroundFigure, tickFontSize, grid, alpha, labelFontSize, data, xTickLabelHorizontalAlignment, hideXGrid, figureSize, colorBackgroundData, xTickLabelRotation, dpi

Graph methods

done(fp=None)

Implement the desired doneAction, after data processing

process()

process data and prepare plot

setAxisLabel(axisKey, label)

No documentation.

setAxisRange(axisKey, valueRange, paddingFraction=0.1)

Set the range for the axis for a given axis key (generally, ‘x’, or ‘y’)

ValueRange is a two-element tuple of the lowest number and the highest.

By default there is a padding of 10% of the range in either direction. Set paddingFraction = 0 to eliminate this shift

setData(data)

No documentation.

setDoneAction(action)

sets what should happen when the graph is created (see docs above) default is ‘write’.

setFigureSize(figSize)

Set the figure size as an x,y pair.

Scales all graph components but because of matplotlib limitations (esp. on 3d graphs) no all labels scale properly.

setIntegerTicksFromData(unsortedData, axisKey='y', dataSteps=8)

Set the ticks for an axis (usually ‘y’) given the data

setTicks(axisKey, pairs)

Set the tick-labels for a given graph or plot’s axisKey (generally ‘x’, and ‘y’) with a set of pairs

Pairs are tuples of positions and labels.

N.B. – both ‘x’ and ‘y’ ticks have to be set in order to get matplotlib to display either...

setTitle(title)

No documentation.

show()

Calls the show() method of the matplotlib plot. For most matplotlib back ends, this will open a GUI window with the desired graph.

write(fp=None)

Writes the graph to a file. If no file path is given, a temporary file is used.

Graph3DPolygonBars

Inherits from: Graph

class music21.graph.Graph3DPolygonBars(*args, **keywords)

Graph multiple parallel bar graphs in 3D.

This draws bars with polygons, a temporary alternative to using Graph3DBars, above.

Note: Due to matplotib issue Axis ticks do not seem to be adjustable without distorting the graph.

>>> from music21 import *
>>> g = graph.Graph3DPolygonBars()
>>> data = {1:[], 2:[], 3:[]}
>>> for i in range(len(data.keys())):
...    q = [(x, random.choice(range(10*(i+1)))) for x in range(20)]
...    data[data.keys()[i]] = q
>>> g.setData(data)
>>> g.process()
_images/Graph3DPolygonBars.png

Graph3DPolygonBars attributes

Attributes without Documentation: barWidth

Attributes inherited from Graph: doneAction, hideYGrid, fontFamily, colors, axisKeys, marker, axis, title, markerSize, xTickLabelVerticalAlignment, colorGrid, titleFontSize, colorBackgroundFigure, tickFontSize, grid, alpha, labelFontSize, data, xTickLabelHorizontalAlignment, hideXGrid, figureSize, colorBackgroundData, xTickLabelRotation, dpi

Graph3DPolygonBars methods

GraphColorGrid

Inherits from: Graph

class music21.graph.GraphColorGrid(*args, **keywords)

Grid of discrete colored “blocks” to visualize results of a windowed analysis routine.

Data is provided as a list of lists of colors, where colors are specified as a hex triplet, or the common HTML color codes, and based on analysis-specific mapping of colors to results.

>>> from music21 import *
>>> g = graph.GraphColorGrid()
>>> data = [['#55FF00', '#9b0000', '#009b00'], ['#FFD600', '#FF5600'], ['#201a2b', '#8f73bf', '#a080d5', '#403355', '#999999']]
>>> g.setData(data)
>>> g.process()
_images/GraphColorGrid.png

GraphColorGridLegend

Inherits from: Graph

class music21.graph.GraphColorGridLegend(*args, **keywords)

Grid of discrete colored “blocks” where each block can be labeled

Data is provided as a list of lists of colors, where colors are specified as a hex triplet, or the common HTML color codes, and based on analysis-specific mapping of colors to results.

>>> from music21 import *
>>> g = graph.GraphColorGridLegend()
>>> data = []
>>> data.append(('Major', [('C#', '#00AA55'), ('D-', '#5600FF'), ('G#', '#2B00FF')]))
>>> data.append(('Minor', [('C#', '#004600'), ('D-', '#00009b'), ('G#', '#00009B')]))
>>> g.setData(data)
>>> g.process()
_images/GraphColorGridLegend.png

GraphGroupedVerticalBar

Inherits from: Graph

class music21.graph.GraphGroupedVerticalBar(*args, **keywords)

Graph the count of on or more elements in vertical bars

Data set is simply a list of x and y pairs, where there is only one of each x value, and y value is a list of values

>>> from music21 import *
>>> import random
>>> g = graph.GraphGroupedVerticalBar()
>>> data = [('bar%s' % x, {'a':3,'b':2,'c':1}) for x in range(10)]
>>> data
[('bar0', {'a': 3, 'c': 1, 'b': 2}), ('bar1', {'a': 3, 'c': 1, 'b': 2}), ('bar2', {'a': 3, 'c': 1, 'b': 2}), ('bar3', {'a': 3, 'c': 1, 'b': 2}), ('bar4', {'a': 3, 'c': 1, 'b': 2}), ('bar5', {'a': 3, 'c': 1, 'b': 2}), ('bar6', {'a': 3, 'c': 1, 'b': 2}), ('bar7', {'a': 3, 'c': 1, 'b': 2}), ('bar8', {'a': 3, 'c': 1, 'b': 2}), ('bar9', {'a': 3, 'c': 1, 'b': 2})]
>>> g.setData(data)
>>> g.process()

GraphGroupedVerticalBar attributes

Attributes without Documentation: groupLabelHeight, binWidth, roundDigits

Attributes inherited from Graph: doneAction, hideYGrid, fontFamily, colors, axisKeys, marker, axis, title, markerSize, xTickLabelVerticalAlignment, colorGrid, titleFontSize, colorBackgroundFigure, tickFontSize, grid, alpha, labelFontSize, data, xTickLabelHorizontalAlignment, hideXGrid, figureSize, colorBackgroundData, xTickLabelRotation, dpi

GraphGroupedVerticalBar methods

labelBars(ax, rects)

No documentation.

process()

No documentation.

Methods inherited from Graph: done(), setAxisLabel(), setAxisRange(), setData(), setDoneAction(), setFigureSize(), setIntegerTicksFromData(), setTicks(), setTitle(), show(), write()

GraphHistogram

Inherits from: Graph

class music21.graph.GraphHistogram(*args, **keywords)

Graph the count of a single element.

Data set is simply a list of x and y pairs, where there is only one of each x value, and y value is the count or magnitude of that value

>>> from music21 import *
>>> import random
>>> g = graph.GraphHistogram()
>>> data = [(x, random.choice(range(30))) for x in range(50)]
>>> g.setData(data)
>>> g.process()
_images/GraphHistogram.png

GraphHistogram attributes

Attributes without Documentation: binWidth

Attributes inherited from Graph: doneAction, hideYGrid, fontFamily, colors, axisKeys, marker, axis, title, markerSize, xTickLabelVerticalAlignment, colorGrid, titleFontSize, colorBackgroundFigure, tickFontSize, grid, alpha, labelFontSize, data, xTickLabelHorizontalAlignment, hideXGrid, figureSize, colorBackgroundData, xTickLabelRotation, dpi

GraphHistogram methods

GraphHorizontalBar

Inherits from: Graph

class music21.graph.GraphHorizontalBar(*args, **keywords)

Numerous horizontal bars in discrete channels, where bars can be incomplete and/or overlap.

Data provided is a list of pairs, where the first value becomes the key, the second value is a list of x-start, x-length values.

>>> from music21 import *
>>> a = graph.GraphHorizontalBar(doneAction='show')
>>> data = [('Chopin', [(1810, 1849-1810)]), ('Schumanns', [(1810, 1856-1810), (1819, 1896-1819)]), ('Brahms', [(1833, 1897-1833)])]
>>> a.setData(data)
>>> a.process()
_images/GraphHorizontalBar.png

GraphHorizontalBarWeighted

Inherits from: Graph

class music21.graph.GraphHorizontalBarWeighted(*args, **keywords)

Numerous horizontal bars in discrete channels, where bars can be incomplete and/or overlap, and can have different heights and colors within their respective channel.

GraphNetworxGraph

Inherits from: Graph

class music21.graph.GraphNetworxGraph(*args, **keywords)

Grid a networkx graph – which is a graph of nodes and edges. Requires the optional networkx module.

GraphNetworxGraph attributes

networkxGraph

An instance of a networkx graph object.

Attributes inherited from Graph: doneAction, hideYGrid, fontFamily, colors, axisKeys, marker, axis, title, markerSize, xTickLabelVerticalAlignment, colorGrid, titleFontSize, colorBackgroundFigure, tickFontSize, grid, alpha, labelFontSize, data, xTickLabelHorizontalAlignment, hideXGrid, figureSize, colorBackgroundData, xTickLabelRotation, dpi

GraphNetworxGraph methods

GraphScatter

Inherits from: Graph

class music21.graph.GraphScatter(*args, **keywords)

Graph two parameters in a scatter plot. Data representation is a list of points of values.

>>> from music21 import *
>>> g = graph.GraphScatter()
>>> data = [(x, x*x) for x in range(50)]
>>> g.setData(data)
>>> g.process()
_images/GraphScatter.png

GraphScatterWeighted

Inherits from: Graph

class music21.graph.GraphScatterWeighted(*args, **keywords)

A scatter plot where points are scaled in size to represent the number of values stored within.

>>> from music21 import *
>>> g = graph.GraphScatterWeighted()
>>> data = [(23, 15, 234), (10, 23, 12), (4, 23, 5), (15, 18, 120)]
>>> g.setData(data)
>>> g.process()
_images/GraphScatterWeighted.png

Plot3DBars

Inherits from: PlotStream

class music21.graph.Plot3DBars(streamObj, *args, **keywords)

Base class for Stream plotting classes.

Plot3DBars attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

Plot3DBars properties

Properties inherited from PlotStream: id

Plot3DBars methods

PlotFeatures

Inherits from: PlotMultiStream

class music21.graph.PlotFeatures(streamList, featureExtractors, labelList=[], *args, **keywords)

FeatureExtractors can be ids or classes.

PlotFeatures attributes

Attributes without Documentation: format

Attributes inherited from PlotMultiStream: values

PlotFeatures methods

Methods inherited from PlotMultiStream: process(), show(), write()

PlotHistogram

Inherits from: PlotStream

class music21.graph.PlotHistogram(streamObj, *args, **keywords)

Base class for Stream plotting classes.

Plots take a Stream as their arguments, Graphs take any data.

PlotHistogram attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotHistogram properties

Properties inherited from PlotStream: id

PlotHistogram methods

PlotHorizontalBar

Inherits from: PlotStream

class music21.graph.PlotHorizontalBar(streamObj, *args, **keywords)

A graph of events, sorted by pitch, over time

PlotHorizontalBar attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotHorizontalBar properties

Properties inherited from PlotStream: id

PlotHorizontalBar methods

PlotHorizontalBarWeighted

Inherits from: PlotStream

class music21.graph.PlotHorizontalBarWeighted(streamObj, *args, **keywords)

A base class for plots of Scores with weighted (by height) horizontal bars. Many different weighted segments can provide a representation of a dynamic parameter of a Part.

PlotHorizontalBarWeighted attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotHorizontalBarWeighted properties

Properties inherited from PlotStream: id

PlotHorizontalBarWeighted methods

PlotMultiStream

class music21.graph.PlotMultiStream(streamList, labelList=[], *args, **keywords)

Approaches to plotting and graphing multiple Streams. A base class from which Stream plotting Classes inherit.

Provide a list of Streams as an argument. Optionally provide an additional list of labels for each list. If flatten is True, the Streams will automatically be flattened.

PlotMultiStream attributes

Attributes without Documentation: format, values

PlotMultiStream methods

process()

This will process all data, as well as call the done() method. What happens when the done() is called is determined by the the keyword argument doneAction; options are ‘show’ (display immediately), ‘write’ (write the file to a supplied file path), and None (do processing but do not write or show a graph).

Subclass dependent data extracted is stored in the self.data attribute.

show()

Call internal Graphs show() method independently of doneAction set and run with process()

write(fp=None)

Call internal Graphs write() method independently of doneAction set and run with process()

PlotScatter

Inherits from: PlotStream

class music21.graph.PlotScatter(streamObj, *args, **keywords)

Base class for 2D Scatter plots.

PlotScatter attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotScatter properties

Properties inherited from PlotStream: id

PlotScatter methods

PlotScatterWeighted

Inherits from: PlotStream

class music21.graph.PlotScatterWeighted(streamObj, *args, **keywords)

PlotScatterWeighted attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotScatterWeighted properties

Properties inherited from PlotStream: id

PlotScatterWeighted methods

PlotStream

class music21.graph.PlotStream(streamObj, flatten=True, *args, **keywords)

Approaches to plotting and graphing a Stream. A base class from which Stream plotting Classes inherit.

This class has a number of public attributes, but these are generally not intended for direct user application. The data attribute, for example, exposes the internal data format of this plotting routine for testing, but no effort is made to make this data useful outside of the context of the Plot.

Provide a Stream as an arguement. If flatten is True, the Stream will automatically be flattened.

PlotStream attributes

Attributes without Documentation: format, values

PlotStream properties

id

Each PlotStream has a unique id that consists of its format and a string that defines the parameters that are graphed.

PlotStream methods

process()

This will process all data, as well as call the done() method. What happens when the done() is called is determined by the the keyword argument doneAction; options are ‘show’ (display immediately), ‘write’ (write the file to a supplied file path), and None (do processing but do not write or show a graph).

Subclass dependent data extracted is stored in the self.data attribute.

remapQuarterLength(x)

Remap all quarter lengths.

show()

Call internal Graphs show() method independently of doneAction set and run with process()

ticksDynamics(minNameIndex=None, maxNameIndex=None)

Utility method to get ticks in dynamic values.

>>> from music21 import stream; s = stream.Stream()
>>> a = PlotStream(s)
>>> a.ticksDynamics()
[[0, '$pppppp$'], [1, '$ppppp$'], [2, '$pppp$'], [3, '$ppp$'], [4, '$pp$'], [5, '$p$'], [6, '$mp$'], [7, '$mf$'], [8, '$f$'], [9, '$fp$'], [10, '$sf$'], [11, '$ff$'], [12, '$fff$'], [13, '$ffff$'], [14, '$fffff$'], [15, '$ffffff$']]

>>> a.ticksDynamics(3,6)
[[3, '$ppp$'], [4, '$pp$'], [5, '$p$'], [6, '$mp$']]
ticksOffset(offsetMin=None, offsetMax=None, offsetStepSize=None, displayMeasureNumberZero=False, minMaxOnly=False, remap=False)

Get offset ticks. If Measures are found, they will be used to create ticks. If not, offsetStepSize will be used to create offset ticks between min and max. The remap parameter is not yet used.

If minMaxOnly is True, only the first and last values will be provided.

>>> from music21 import corpus, stream, note
>>> s = corpus.parse('bach/bwv281.xml')
>>> a = PlotStream(s)
>>> a.ticksOffset() # on whole score, showing anacrusis spacing
[[0.0, '0'], [1.0, '1'], [5.0, '2'], [9.0, '3'], [13.0, '4'], [17.0, '5'], [21.0, '6'], [25.0, '7'], [29.0, '8']]

>>> a = PlotStream(s.parts[0].flat) # on a Part
>>> a.ticksOffset() # on whole score, showing anacrusis spacing
[[0.0, '0'], [1.0, '1'], [5.0, '2'], [9.0, '3'], [13.0, '4'], [17.0, '5'], [21.0, '6'], [25.0, '7'], [29.0, '8']]
>>> a.ticksOffset(8, 12, 2)
[[9.0, '3']]
>>> a = PlotStream(s.parts[0].flat) # on a Flat collection
>>> a.ticksOffset(8, 12, 2)
[[9.0, '3']]

>>> n = note.Note('a') # on a raw collection of notes with no measures
>>> s = stream.Stream()
>>> s.repeatAppend(n, 10)
>>> a = PlotStream(s) # on a Part
>>> a.ticksOffset() # on whole score
[[0, '0'], [10, '10']]
ticksPitchClass(pcMin=0, pcMax=11)

Utility method to get ticks in pitch classes

>>> from music21 import corpus
>>> s = corpus.parse('bach/bwv324.xml')
>>> a = PlotStream(s)
>>> [x for x,y in a.ticksPitchClass()]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
ticksPitchClassUsage(pcMin=0, pcMax=11, showEnharmonic=True, blankLabelUnused=True, hideUnused=False)

Get ticks and labels for pitch classes based on usage. That is, show the most commonly used enharmonic first.

>>> from music21 import corpus
>>> s = corpus.parse('bach/bwv324.xml')
>>> a = PlotStream(s)
>>> [x for x, y in a.ticksPitchClassUsage(hideUnused=True)]
[0, 2, 3, 4, 6, 7, 9, 11]

>>> s = corpus.parse('bach/bwv281.xml')
>>> a = PlotStream(s)
>>> [x for x, y in a.ticksPitchClassUsage(showEnharmonic=True, hideUnused=True)]
[0, 2, 3, 4, 5, 7, 9, 10, 11]
>>> [x for x, y in a.ticksPitchClassUsage(showEnharmonic=True, blankLabelUnused=False)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
>>> s = corpus.parse('schumann/opus41no1/movement2.xml')
>>> a = PlotStream(s)
>>> [x for x, y in a.ticksPitchClassUsage(showEnharmonic=True)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
ticksPitchSpaceChromatic(pitchMin=36, pitchMax=100)

Utility method to get ticks in pitch space values.

>>> from music21 import stream; s = stream.Stream()
>>> a = PlotStream(s)
>>> [x for x,y in a.ticksPitchSpaceChromatic(60,72)]
[60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72]
ticksPitchSpaceOctave(pitchMin=36, pitchMax=100)

Utility method to get ticks in pitch space only for every octave.

>>> from music21 import stream; s = stream.Stream()
>>> a = PlotStream(s)
>>> a.ticksPitchSpaceOctave()
[[36, 'C2'], [48, 'C3'], [60, 'C4'], [72, 'C5'], [84, 'C6'], [96, 'C7']]
ticksPitchSpaceQuartertone(pitchMin=36, pitchMax=100)

Utility method to get ticks in pitch space values.

ticksPitchSpaceQuartertoneUsage(pcMin=36, pcMax=72, showEnharmonic=False, blankLabelUnused=True, hideUnused=False)

Get ticks and labels for pitch space based on usage. That is, show the most commonly used enharmonic first.

ticksPitchSpaceUsage(pcMin=36, pcMax=72, showEnharmonic=False, blankLabelUnused=True, hideUnused=False)

Get ticks and labels for pitch space based on usage. That is, show the most commonly used enharmonic first.

>>> from music21 import corpus
>>> s = corpus.parse('bach/bwv324.xml')
>>> a = PlotStream(s.parts[0])
>>> [x for x, y in a.ticksPitchSpaceUsage(hideUnused=True)]
[64, 66, 67, 69, 71, 72]

>>> s = corpus.parse('schumann/opus41no1/movement2.xml')
>>> a = PlotStream(s)
>>> [x for x, y in a.ticksPitchSpaceUsage(showEnharmonic=True, hideUnused=True)]
[36, 38, 40, 41, 43, 44, 45, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72]
ticksQuarterLength(min=0.25, max=4, remap=True)

Get ticks for quarterLength. If remap is True, the remapQuarterLength() function will be used to scale displayed quarter lengths by log base 2.

>>> from music21 import stream; s = stream.Stream()
>>> a = PlotStream(s)
write(fp=None)

Call internal Graphs write() method independently of doneAction set and run with process()

PlotWindowedAardenEssen

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedAardenEssen(streamObj, *args, **keywords)

Stream plotting of windowed version of Aarden-Essen analysis routine. See AardenEssen for more details.

PlotWindowedAardenEssen attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedAardenEssen properties

Properties inherited from PlotStream: id

PlotWindowedAardenEssen methods

PlotWindowedAnalysis

Inherits from: PlotStream

class music21.graph.PlotWindowedAnalysis(streamObj, processor=None, *args, **keywords)

Base Plot for windowed analysis routines.

PlotWindowedAnalysis attributes

Attributes without Documentation: format

Attributes inherited from PlotStream: values

PlotWindowedAnalysis properties

Properties inherited from PlotStream: id

PlotWindowedAnalysis methods

process()

Process method here overridden to provide legend.

write(fp=None)

Process method here overridden to provide legend.

Methods inherited from PlotStream: remapQuarterLength(), show(), ticksDynamics(), ticksOffset(), ticksPitchClass(), ticksPitchClassUsage(), ticksPitchSpaceChromatic(), ticksPitchSpaceOctave(), ticksPitchSpaceQuartertone(), ticksPitchSpaceQuartertoneUsage(), ticksPitchSpaceUsage(), ticksQuarterLength()

PlotWindowedBellmanBudge

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedBellmanBudge(streamObj, *args, **keywords)

Stream plotting of windowed version of Bellman-Budge analysis routine. See BellmanBudge for more details.

PlotWindowedBellmanBudge attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedBellmanBudge properties

Properties inherited from PlotStream: id

PlotWindowedBellmanBudge methods

PlotWindowedKrumhanslKessler

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedKrumhanslKessler(streamObj, *args, **keywords)

Stream plotting of windowed version of Krumhansl-Kessler analysis routine. See KrumhanslKessler for more details.

PlotWindowedKrumhanslKessler attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedKrumhanslKessler properties

Properties inherited from PlotStream: id

PlotWindowedKrumhanslKessler methods

PlotWindowedSimpleWeights

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedSimpleWeights(streamObj, *args, **keywords)

Stream plotting of windowed version of Simple Weights analysis routine. See SimpleWeights for more details.

PlotWindowedSimpleWeights attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedSimpleWeights properties

Properties inherited from PlotStream: id

PlotWindowedSimpleWeights methods

PlotWindowedTemperleyKostkaPayne

Inherits from: PlotWindowedAnalysis, PlotStream

class music21.graph.PlotWindowedTemperleyKostkaPayne(streamObj, *args, **keywords)

Stream plotting of windowed version of Temperley-Kostka-Payne analysis routine. See TemperleyKostkaPayne for more details.

PlotWindowedTemperleyKostkaPayne attributes

Attributes without Documentation: values

Attributes inherited from PlotWindowedAnalysis: format

PlotWindowedTemperleyKostkaPayne properties

Properties inherited from PlotStream: id

PlotWindowedTemperleyKostkaPayne methods