Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/generators/triads.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # See https://github.com/networkx/networkx/pull/1474 |
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2 # Copyright 2011 Reya Group <http://www.reyagroup.com> |
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3 # Copyright 2011 Alex Levenson <alex@isnotinvain.com> |
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4 # Copyright 2011 Diederik van Liere <diederik.vanliere@rotman.utoronto.ca> |
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5 """Functions that generate the triad graphs, that is, the possible |
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6 digraphs on three nodes. |
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7 |
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8 """ |
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9 from networkx.classes import DiGraph |
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10 |
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11 __all__ = ["triad_graph"] |
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12 |
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13 #: Dictionary mapping triad name to list of directed edges in the |
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14 #: digraph representation of that triad (with nodes 'a', 'b', and 'c'). |
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15 TRIAD_EDGES = { |
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16 "003": [], |
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17 "012": ["ab"], |
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18 "102": ["ab", "ba"], |
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19 "021D": ["ba", "bc"], |
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20 "021U": ["ab", "cb"], |
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21 "021C": ["ab", "bc"], |
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22 "111D": ["ac", "ca", "bc"], |
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23 "111U": ["ac", "ca", "cb"], |
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24 "030T": ["ab", "cb", "ac"], |
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25 "030C": ["ba", "cb", "ac"], |
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26 "201": ["ab", "ba", "ac", "ca"], |
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27 "120D": ["bc", "ba", "ac", "ca"], |
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28 "120U": ["ab", "cb", "ac", "ca"], |
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29 "120C": ["ab", "bc", "ac", "ca"], |
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30 "210": ["ab", "bc", "cb", "ac", "ca"], |
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31 "300": ["ab", "ba", "bc", "cb", "ac", "ca"], |
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32 } |
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33 |
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34 |
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35 def triad_graph(triad_name): |
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36 """Returns the triad graph with the given name. |
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37 |
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38 Each string in the following tuple is a valid triad name:: |
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39 |
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40 ('003', '012', '102', '021D', '021U', '021C', '111D', '111U', |
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41 '030T', '030C', '201', '120D', '120U', '120C', '210', '300') |
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42 |
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43 Each triad name corresponds to one of the possible valid digraph on |
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44 three nodes. |
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45 |
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46 Parameters |
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47 ---------- |
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48 triad_name : string |
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49 The name of a triad, as described above. |
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50 |
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51 Returns |
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52 ------- |
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53 :class:`~networkx.DiGraph` |
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54 The digraph on three nodes with the given name. The nodes of the |
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55 graph are the single-character strings 'a', 'b', and 'c'. |
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56 |
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57 Raises |
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58 ------ |
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59 ValueError |
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60 If `triad_name` is not the name of a triad. |
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61 |
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62 See also |
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63 -------- |
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64 triadic_census |
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65 |
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66 """ |
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67 if triad_name not in TRIAD_EDGES: |
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68 raise ValueError( |
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69 f'unknown triad name "{triad_name}"; use one of the triad names' |
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70 " in the TRIAD_NAMES constant" |
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71 ) |
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72 G = DiGraph() |
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73 G.add_nodes_from("abc") |
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74 G.add_edges_from(TRIAD_EDGES[triad_name]) |
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75 return G |