On Thu, Nov 29, 2012 at 10:52 AM, Jeff Hemsley <[email protected]>wrote:
[...]
> The area of code that I'm actually interested in making more efficient
> is where I am fading out the colors of links/vertex because it is a
> loop in a loop and I was hoping there was a way to vectorize it.
>
You can replace the inner loop with something like this:
alpha.vec.idx <- match(E(g)$date, possible.dates) - date.fade.index[1] + 1
alpha.vec.idx <- ifelse(alpha.vec.idx < 1 | alpha.vec.idx >
length(alpha.vec),
1, alpha.vec.idx)
E(g)$alpha <- alpha.vec[alpha.vec.idx]
V(g)$alpha <- sapply(V(g), function(v) { max(E(g)$alpha[incident(g, v)]) })
It requires that the first element in alpha.vec is zero.
This is still a loop, though, because of the sapply, but I believe that it
is faster. Actually I would think that the bottleneck is exporting the PNG
files, but I might be wrong....
Gabor
>
> The reason I ask is because these networks are small, but I have far
> larger ones I'd like to automate.
>
> Thoughts on that?
>
> On Thu, Nov 29, 2012 at 7:05 AM, Gábor Csárdi <[email protected]> wrote:
> > Hi Jeff, I think it looks great!
> >
> > What exactly do you want to improve on the code? It all looks very
> > reasonable for me, so unless you desire another feature or the code is
> slow,
> > why change it? Do not change code that does everything you want. :)
> >
> > Btw. the igraph wiki turned out to be not very efficient to share igraph
> > related code snipplets, so maybe we will start a blog that aggregates
> them,
> > or move to gists at github. I want to put code like yours on the igraph
> > homepage somehow.
> >
> > Best
> > Gabor
> >
> >
> > On Wed, Nov 28, 2012 at 3:53 PM, Jeff Hemsley <[email protected]
> >
> > wrote:
> >>
> >> I'm somewhat new to iGraph, and pretty good at R, but I am still
> >> learning. I found a way to animate an evolving network with iGraph in
> >> R and would love to get any feedback on how to improve the code.
> >>
> >> The code, well commented, is here:
> >>
> >>
> >>
> http://somelab.net/2012/11/how-to-create-a-network-animation-with-r-and-the-igraph-package/
> >>
> >> Any feedback, suggestions, comments are welcome.
> >> Thanks!
> >>
> >> --
> >> Jeff Hemsley
> >> Doctoral Student
> >> The iSchool
> >> University of Washington
> >> http://ischool.uw.edu/
> >> [email protected]
> >>
> >> _______________________________________________
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> >> [email protected]
> >> https://lists.nongnu.org/mailman/listinfo/igraph-help
> >
> >
> >
> >
> > --
> > Gabor Csardi <[email protected]> MTA KFKI RMKI
> >
> >
> > _______________________________________________
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> > [email protected]
> > https://lists.nongnu.org/mailman/listinfo/igraph-help
> >
>
>
>
> --
> Jeff Hemsley
> Doctoral Candidate
> The Information School
> University of Washington
> http://ischool.uw.edu/
> [email protected]
>
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>
--
Gabor Csardi <[email protected]> MTA KFKI RMKI
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