Search found 18 matches

by martin.pernollet
12 Feb 2012 20:00
Forum: Layouts
Topic: Parallel Force Atlas
Replies: 25
Views: 20333

Re: Parallel Force Atlas

Hi, I recently noticed my laptop was able to switch to a non nvidia graphic card, so you have to explicitly set from nvidia settings panel that you want the OS to always use your nvidia, and not an alternative (maybe less energy consuming) chip. See a screenshot in this discussion: http://forum.joga...
by martin.pernollet
12 Sep 2011 14:08
Forum: Layouts
Topic: Parallel Force Atlas
Replies: 25
Views: 20333

Re: Parallel Force Atlas

Hi Paul, I have not been has lucky as Clément, here's my experience: 1) I added the Parallel FA plugin the 10th september to Gephi 0.8, and tried to run it on a 1600 nodes & 17000 edges graph. 2) FA1 and your version run at the same visual speed: roughly 1 iteration per second 3) When checking "run ...
by martin.pernollet
29 Jun 2011 09:45
Forum: Layouts
Topic: 3D Fruchterman Reingold
Replies: 1
Views: 1436

Re: 3D Fruchterman Reingold

Hi, I haven't seen any way to work with 3d in Gephi up to now. Maybe you can try the 3d viewer of Jung, although quite experimental in my opinion. <advertising> If you already have the data structure and algorithm working, you can use Jzy3d that has primitives you can use for rendering a graph. See ...
by martin.pernollet
30 May 2011 17:18
Forum: Layouts
Topic: ForceAtlas publication
Replies: 33
Views: 41763

Re: ForceAtlas publication

Hi Mathieu, Thanks for the notice! I tried to look at the code to understand what changed, but it does not seem to be commited on branch 0.8 [1] neither on 0.7 [2]. Am I wrong on something? Cheers, Martin [1] http://bazaar.launchpad.net/~gephi.team/gephi/0.8/view/head:/LayoutPlugin/src/org/gephi/lay...
by martin.pernollet
28 Feb 2011 12:37
Forum: Layouts
Topic: ForceAtlas publication
Replies: 33
Views: 41763

Re: ForceAtlas publication

Tell what you would develop, unanswered questions, what you dislike and so on... :) Something I would require as a force atlas user is a set of advices for settings the algorithm parameters. Actually I would both like to know how you work them, and discuss a thing I noticed. Usually, the node size ...
by martin.pernollet
22 Feb 2011 13:02
Forum: Layouts
Topic: ForceAtlas publication
Replies: 33
Views: 41763

Re: ForceAtlas publication

III. Spatialization quality Here we compare ForceAtlas to other layouts such as OpenOrd, Yifan Hu and Früchtermann Rheingold, on different graphs. We do not test performance, but quality, meaning: interpretability. III.1. Are close nodes more connected ? III.2. Are close nodes structurally equivale...
by martin.pernollet
18 Feb 2011 10:42
Forum: Layouts
Topic: Layout with bounds
Replies: 6
Views: 3254

Re: Layout with bounds

Concentrate nodes in radial or concentric "bands". Right! I will most probably try to have nodes with a common "look" (e.g. degree and common neighbour) gathered so that they always appear closed in a region, and no other "kind of node" in the region. I'll tell you if I go further on this attempt. ...
by martin.pernollet
17 Feb 2011 12:06
Forum: Layouts
Topic: Layout with bounds
Replies: 6
Views: 3254

Re: Layout with bounds

Applying a strict border force on ForceAtlas works really perfectly: nodes will stick and smoothly slide along the border if there is too much repulsion coming from interior of the bounds.
The work is trivial to do, so I only send a picture, but ask me if you want a sample code.
Martin
by martin.pernollet
17 Feb 2011 10:37
Forum: Layouts
Topic: ForceAtlas publication
Replies: 33
Views: 41763

Re: ForceAtlas publication

You'll at least tell me what interests you to read I'm especially interested in understanding the details about the forces the algorithm relies on. We can read it in the code, but it's nicer on a paper :) Sometime I'm thinking about visualizing the forces, at least repulsion using for example a 3d ...