Generate certain number of planar graphs with graphs.planar_graphs?

asked 2021-03-22 16:20:44 +0100

lucv
13 ●4

updated 2021-03-22 18:15:45 +0100

slelievre
17704 ●22 ●160 ●350 http://carva.org/samue...

I want to use graphs.planar_graphs (which is based on plantri) to generate 1000 planar graphs of a certain size (e.g. 50 vertices), i.e. I want to use the iterator exactly 1000 times and not until it has created all possible solutions.

How can I do this with graphs.planar_graphs, since this is an iterator that just creates all possible planar graphs on 50 vertices (which is a lot more than I need and also too computationally expensive)?

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Also asked as Stack Overflow question 66749544.

slelievre ( 2021-03-22 20:42:19 +0100 )edit

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answered 2021-03-22 18:23:28 +0100

slelievre
17704 ●22 ●160 ●350 http://carva.org/samue...

Iterators are wonderful.

One of the ways in which they are wonderful is you can grab as many or as few elements as you want.

The iterator for all planar graphs of order 50:

sage: planar_50 = graphs.planar_graphs(50)

Grab the first four:

sage: planar_50_4 = [next(planar_50) for _ in range(4)]

Check:

sage: planar_50_4
[Graph on 50 vertices,
 Graph on 50 vertices,
 Graph on 50 vertices,
 Graph on 50 vertices]

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Asked: 2021-03-22 15:43:12 +0100

Seen: 288 times

Last updated: Mar 22 '21

Generate certain number of planar graphs with graphs.planar_graphs? edit