LatticeData["HexagonalLattice"]
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Normal[%206]
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{{-1,1},{0,-1}}
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ListPlot[Catenate[Table[i{-1,1}+j{0,-1},{i,10},{j,10}]]]
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Get["https://raw.githubusercontent.com/szhorvat/IGraphM/master/IGInstaller.m"]
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The currently installed versions of IGraph/M are: {PacletObject[IGraphM,0.3.108,<>]}
Installing IGraph/M is complete: PacletObject[IGraphM,0.3.112,<>].
It can now be loaded using the command Get["IGraphM`"].
An older version of IGraph/M was already loaded. It is recommended to restart the Mathematica kernel before loading the new version.
Get["IGraphM`"]
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IGraph/M 0.3.112 (May 7, 2019)
Evaluate
IGDocumentation[]
to get started.