graph ← graph ##.insnode vertex             ⍝ Insert vertex ⍵ in graph ⍺.

Returns  a  new  graph  with  extra unconnected vertices up to and including the
requested one.

Examples:

    a                           ⍝ graph "a".
┌───┬─┬───┬───┬─┐
│2 3│3│2 4│1 5│3│
└───┴─┴───┴───┴─┘

      disp a insnode 10         ⍝ ... with new node 10.
┌───┬─┬───┬───┬─┬┬┬┬┬┐
│2 3│3│2 4│1 5│3││││││
└───┴─┴───┴───┴─┴┴┴┴┴┘

See also: Graphs remnode gperm inslink

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