I didn't know about triad_census(). Thanks for the pointer! On 16 July 2015 at 14:21, Gábor Csárdi <[email protected]> wrote: > I cannot recall what the actual reason was, but one possible > explanation is that even for moderately sized graphs, if they are > sparse, you have a lot of those "motifs", more than what you can count > in an 'int'. > > Btw. triad_census gives you the count for those "motifs" as well, and > it already overflows for a ring with 10000 vertices and edges: > > triad_census(make_ring(10, directed = TRUE)) > #> [1] 50 60 0 0 0 10 0 0 0 0 0 0 0 0 0 0 > triad_census(make_ring(10000, directed = TRUE)) > #> [1] -271196661 99960000 0 0 0 10000 > #> [7] 0 0 0 0 0 0 > #> [13] 0 0 0 0 > > It does not even warn you, which is pretty bad, actually..... > > Gabor > > On Thu, Jul 16, 2015 at 3:21 AM, Szabolcs Horvát <[email protected]> wrote: >> Dear All, >> >> igraph's motif counting functions (motifs()) will not count >> unconnected subgraphs and always return NA for the 1st, 2nd and 4th >> element of the result (for 3-motifs). >> >> The reasoning is that (quoting from the docs): >> >>> Note that for unconnected subgraphs, which are not considered to be >>> motifs, the result will be NA. >> >> Is there any _technical_ reason for this behaviour? I understand that >> according to some definitions, unconnected subgraphs are not >> considered motifs, but in many applications it is still useful to >> count _all_ size-k subgraphs. >> >> It would be useful if motifs() returned all counts. It is much easier >> to simply ignore those I don't want (when I don't want them) than >> having to separately count the missing ones. >> >> Szabolcs >> >> _______________________________________________ >> igraph-help mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/igraph-help > > _______________________________________________ > igraph-help mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/igraph-help
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