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Re: [igraph] speed slowdown with version change

From: Gábor Csárdi
Subject: Re: [igraph] speed slowdown with version change
Date: Fri, 14 Dec 2018 14:20:38 +0000

Well, you'll have to show the code you are running.  Gabor
On Fri, Dec 14, 2018 at 2:18 PM Robin Cowan
<address@hidden> wrote:
> I have a small simulation that creates a network of agents who then play a 
> game on the network.
> I noticed that when I run the simulation under R 3.1.3 igraph 0.7.1 it takes 
> about 4 seconds.
> When I run it using R 3.5.1 with igraph 1.2.2 it takes about 4 minutes.
> I use igraph to create a network and then extract neighbourhoods. The 
> neighbourhoods are what is actually used  to get the nodes to play the game.
> I re-wrote it to remove igraph from the code — to test whether igraph is the 
> issue, I created a list directly which represented the neighbourhoods.
> With that elimination of igraph (and no other changes) it takes about 4 
> seconds under R 3.5.1
> Some of the maintainers on the R list looked and came tot he same conclusion. 
> The problem is with igraph changes between 0,7 and 1.2.
> Has this come to light before?
> Thanks,
> Robin Cowan
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