[R-SIG-Mac] Different performance with different R versions

[Ista Zahn]

The igraph slowdown is known, and discussed in several places, including

https://github.com/igraph/rigraph/issues/166
https://lists.nongnu.org/archive/html/igraph-help/2015-06/msg00067.html
https://github.com/igraph/rigraph/issues/194

--Ista
On Fri, Dec 14, 2018 at 6:41 AM Martin Maechler
<maechler using stat.math.ethz.ch> wrote:
>
> >>>>> Ista Zahn
> >>>>>     on Fri, 14 Dec 2018 05:58:25 -0500 writes:
>
>     > This isn't Mac specific (I can reproduce it in Linux). Switching the
>     > igraph from version from 1.2.2 (slow) to 0.7.1 (fast) is enough, so
>     > this also has nothing to do with R itself. This should be reported to
>     > https://igraph.org/r/, either on the mailing list, bug tracker, or
>     > both.
>
>     > Best,
>     > Ista
>
> Indeed (on Linux, too)
>
> A much shorter (and 5x faster running) version of the repr.ex.
> R script is appended (it uses specific .libPaths() to get the
>   correct version if igraph).
>
> Martin
>