Gephi forums

Re: GEXF and node size

2018-03-13T00:25:32+01:00

One last test. I generated a GEXF with 9 nodes: 6 x size 20.0, 1 x size 24.0, 2 x size 25.0. The resulting output shows as below. This is not usefully viewable. Could I suggest you revisit your scaling code?

Statistics:Posted by Crispy — 13 Mar 2018 00:25

Re: GEXF and node size

2018-03-12T23:57:52+01:00

Please note, I also subsequently switched off auto-scale on loading the GEXF as you suggested. This made no difference to either the one node or two node size GEXF tests.

Statistics:Posted by Crispy — 12 Mar 2018 23:57

Re: GEXF and node size

2018-03-12T23:48:16+01:00

Thanks. I looked at the code, hacked out the irrelevant stuff and produced this:

CODE:

package nodesizegephi;import java.util.ArrayList;import java.util.List;public class NodeSizeGephi{    private static float sizeMinimum, sizeMaximum;    private static void setDefaults() {        sizeMaximum = 100f;        sizeMinimum = 4f;    }        public static void main(String[] args)    {        setDefaults();                //... Inject my two nodes        List nodes = new ArrayList<>();        nodes.add(new Node(20.0f));        nodes.add(new Node(21.0f));        float sizeMin = Float.POSITIVE_INFINITY;        float sizeMax = Float.NEGATIVE_INFINITY;        float sizeRatio = 0f;        //Measure        for( Node node : nodes )        {            sizeMin = Math.min(node.getSize(), sizeMin);            sizeMax = Math.max(node.getSize(), sizeMax);        }        if (sizeMin != 0 && sizeMax != 0)        {            if (sizeMin == sizeMax) {                sizeRatio = sizeMinimum / sizeMin;            } else {                sizeRatio = (sizeMaximum - sizeMinimum) / (sizeMax - sizeMin);            }            //Scale node size            for( Node node : nodes )            {                float size = (node.getSize() - sizeMin) * sizeRatio + sizeMinimum;                node.setSize(size);            }        }                nodes.forEach((node)->System.out.println("Node size: " +node.getSize()));    }}class Node{    private float size;    public Node(float size)    {        this.size = size;    }    public float getSize() {        return size;    }    public void setSize(float size) {        this.size = size;    }}

Running this I get returned:
Node size: 4.0
Node size: 100.0

Which are the max and min sizes. The centroid stuff in the original code will not change things I believe as nodeSize will only be 1 (with two nodes). So my node sizes, originally marginally different become wildly altered.

Seeing this, I tried with a GEXF with just one node (size 21.0) to see what would happen (nodeSize would be zero).
:

:

It produced this (without me having adjusted anything):

Statistics:Posted by Crispy — 12 Mar 2018 23:48

Re: GEXF and node size

2018-03-12T17:31:19+01:00

Hi,

This is the scaler https://github.com/gephi/gephi/blob/mas ... caler.java But I think you can disable it during import report.

Statistics:Posted by eduramiba — 12 Mar 2018 17:31

GEXF and node size

2018-03-12T15:41:15+01:00

I have a simple GEXF file with two nodes, size 20.0 and size 21.0:

CODE:

   Tester  Node size test

They generate vastly different size nodes as shown below. The smaller node (20.0) is just visible on the top left of the 'z'. The larger (red) node is significantly larger. What is the size ratio algorithm? I see someone asked a similar question nearly two years ago but without reply.

Statistics:Posted by Crispy — 12 Mar 2018 15:41