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annotate planemo/lib/python3.7/site-packages/networkx/generators/triads.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # triads.py - generators for triad graphs
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2 #
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3 # Copyright 2015 NetworkX developers.
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4 # Copyright 2011 Reya Group <http://www.reyagroup.com>
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5 # Copyright 2011 Alex Levenson <alex@isnotinvain.com>
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6 # Copyright 2011 Diederik van Liere <diederik.vanliere@rotman.utoronto.ca>
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7 #
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8 # This file is part of NetworkX.
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9 #
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10 # NetworkX is distributed under a BSD license; see LICENSE.txt for more
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11 # information.
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12 """Functions that generate the triad graphs, that is, the possible
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13 digraphs on three nodes.
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14
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15 """
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16 from networkx.classes import DiGraph
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17
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18 __all__ = ['triad_graph']
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19
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20 #: Dictionary mapping triad name to list of directed edges in the
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21 #: digraph representation of that triad (with nodes 'a', 'b', and 'c').
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22 TRIAD_EDGES = {'003': [],
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23 '012': ['ab'],
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24 '102': ['ab', 'ba'],
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25 '021D': ['ba', 'bc'],
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26 '021U': ['ab', 'cb'],
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27 '021C': ['ab', 'bc'],
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28 '111D': ['ac', 'ca', 'bc'],
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29 '111U': ['ac', 'ca', 'cb'],
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30 '030T': ['ab', 'cb', 'ac'],
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31 '030C': ['ba', 'cb', 'ac'],
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32 '201': ['ab', 'ba', 'ac', 'ca'],
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33 '120D': ['bc', 'ba', 'ac', 'ca'],
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34 '120U': ['ab', 'cb', 'ac', 'ca'],
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35 '120C': ['ab', 'bc', 'ac', 'ca'],
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36 '210': ['ab', 'bc', 'cb', 'ac', 'ca'],
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37 '300': ['ab', 'ba', 'bc', 'cb', 'ac', 'ca']
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38 }
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39
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40
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41 def triad_graph(triad_name):
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42 """Returns the triad graph with the given name.
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43
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44 Each string in the following tuple is a valid triad name::
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45
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46 ('003', '012', '102', '021D', '021U', '021C', '111D', '111U',
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47 '030T', '030C', '201', '120D', '120U', '120C', '210', '300')
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48
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49 Each triad name corresponds to one of the possible valid digraph on
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50 three nodes.
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51
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52 Parameters
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53 ----------
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54 triad_name : string
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55 The name of a triad, as described above.
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56
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57 Returns
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58 -------
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59 :class:`~networkx.DiGraph`
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60 The digraph on three nodes with the given name. The nodes of the
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61 graph are the single-character strings 'a', 'b', and 'c'.
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62
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63 Raises
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64 ------
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65 :exc:`ValueError`
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66 If `triad_name` is not the name of a triad.
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67
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68 See also
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69 --------
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70 triadic_census
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71
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72 """
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73 if triad_name not in TRIAD_EDGES:
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74 raise ValueError('unknown triad name "{}"; use one of the triad names'
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75 ' in the TRIAD_NAMES constant'.format(triad_name))
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76 G = DiGraph()
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77 G.add_nodes_from('abc')
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78 G.add_edges_from(TRIAD_EDGES[triad_name])
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79 return G