Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/operators/unary.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 """Unary operations on graphs""" |
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2 import networkx as nx |
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3 |
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4 __all__ = ["complement", "reverse"] |
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5 |
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6 |
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7 def complement(G): |
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8 """Returns the graph complement of G. |
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9 |
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10 Parameters |
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11 ---------- |
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12 G : graph |
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13 A NetworkX graph |
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14 |
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15 Returns |
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16 ------- |
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17 GC : A new graph. |
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18 |
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19 Notes |
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20 ------ |
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21 Note that complement() does not create self-loops and also |
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22 does not produce parallel edges for MultiGraphs. |
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23 |
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24 Graph, node, and edge data are not propagated to the new graph. |
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25 """ |
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26 R = G.__class__() |
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27 R.add_nodes_from(G) |
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28 R.add_edges_from( |
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29 ((n, n2) for n, nbrs in G.adjacency() for n2 in G if n2 not in nbrs if n != n2) |
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30 ) |
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31 return R |
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32 |
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33 |
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34 def reverse(G, copy=True): |
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35 """Returns the reverse directed graph of G. |
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36 |
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37 Parameters |
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39 G : directed graph |
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40 A NetworkX directed graph |
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41 copy : bool |
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42 If True, then a new graph is returned. If False, then the graph is |
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43 reversed in place. |
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44 |
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45 Returns |
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46 ------- |
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47 H : directed graph |
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48 The reversed G. |
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49 |
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50 """ |
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51 if not G.is_directed(): |
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52 raise nx.NetworkXError("Cannot reverse an undirected graph.") |
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53 else: |
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54 return G.reverse(copy=copy) |