Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/isolate.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 """ |
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2 Functions for identifying isolate (degree zero) nodes. |
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3 """ |
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4 |
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5 __all__ = ["is_isolate", "isolates", "number_of_isolates"] |
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6 |
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7 |
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8 def is_isolate(G, n): |
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9 """Determines whether a node is an isolate. |
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10 |
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11 An *isolate* is a node with no neighbors (that is, with degree |
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12 zero). For directed graphs, this means no in-neighbors and no |
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13 out-neighbors. |
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14 |
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15 Parameters |
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16 ---------- |
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17 G : NetworkX graph |
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18 |
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19 n : node |
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20 A node in `G`. |
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21 |
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22 Returns |
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23 ------- |
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24 is_isolate : bool |
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25 True if and only if `n` has no neighbors. |
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26 |
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27 Examples |
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28 -------- |
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29 >>> G = nx.Graph() |
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30 >>> G.add_edge(1, 2) |
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31 >>> G.add_node(3) |
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32 >>> nx.is_isolate(G, 2) |
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33 False |
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34 >>> nx.is_isolate(G, 3) |
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35 True |
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36 """ |
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37 return G.degree(n) == 0 |
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38 |
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39 |
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40 def isolates(G): |
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41 """Iterator over isolates in the graph. |
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42 |
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43 An *isolate* is a node with no neighbors (that is, with degree |
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44 zero). For directed graphs, this means no in-neighbors and no |
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45 out-neighbors. |
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46 |
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47 Parameters |
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48 ---------- |
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49 G : NetworkX graph |
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50 |
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51 Returns |
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52 ------- |
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53 iterator |
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54 An iterator over the isolates of `G`. |
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55 |
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56 Examples |
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57 -------- |
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58 To get a list of all isolates of a graph, use the :class:`list` |
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59 constructor:: |
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60 |
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61 >>> G = nx.Graph() |
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62 >>> G.add_edge(1, 2) |
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63 >>> G.add_node(3) |
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64 >>> list(nx.isolates(G)) |
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65 [3] |
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66 |
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67 To remove all isolates in the graph, first create a list of the |
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68 isolates, then use :meth:`Graph.remove_nodes_from`:: |
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69 |
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70 >>> G.remove_nodes_from(list(nx.isolates(G))) |
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71 >>> list(G) |
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72 [1, 2] |
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73 |
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74 For digraphs, isolates have zero in-degree and zero out_degre:: |
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75 |
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76 >>> G = nx.DiGraph([(0, 1), (1, 2)]) |
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77 >>> G.add_node(3) |
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78 >>> list(nx.isolates(G)) |
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79 [3] |
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80 |
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81 """ |
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82 return (n for n, d in G.degree() if d == 0) |
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83 |
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84 |
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85 def number_of_isolates(G): |
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86 """Returns the number of isolates in the graph. |
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87 |
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88 An *isolate* is a node with no neighbors (that is, with degree |
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89 zero). For directed graphs, this means no in-neighbors and no |
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90 out-neighbors. |
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91 |
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92 Parameters |
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93 ---------- |
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94 G : NetworkX graph |
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95 |
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96 Returns |
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97 ------- |
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98 int |
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99 The number of degree zero nodes in the graph `G`. |
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100 |
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101 """ |
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102 # TODO This can be parallelized. |
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103 return sum(1 for v in isolates(G)) |