||Networks / Pajek
|Package for Large Network Analysis
visualize genealogies with Pajek
I would like to use Pajek for laying out an old family tree, people
around 1530, in GEDCOM format.
I need a special layout because there used to be a lot of 2nd, 3rd
or 4th weddings and other "incidents".
I have donwloaded pajek and wanted to play with it but couldn't find
the right options to use to layout a standard GEDCOM file.
When I download the "Oldham.ged" file for testing, Pajek recognize
the format and generates FAMS number in the "vector" line. From that,
all I can do is generate a circular layout with the "draw" button
(I need to increase the number of vertices in the option menu first.)
Could you provide me with a simple sequence of operations I should
perform to layout the family graph nicely?
Let us take the
as an example. Download it and read into Pajek.
We shall represent the genelogy as a p-graph.
For details on p-graphs see the Douglas White's
Options/Max vertices to draw 10000
read Ged file ... using network read buttun
The network has 17804 vertices and 17661 arcs. Usually several
(weakly connected) components exist in large genealogies. They
can (should?) be analysed separately.
There are 153 nontrivial weak components (clusters);
cluster 18 has 1117 vertices. Let's extract it and
produce an initial layout using macro LAYERS.
Operations/Extract from network/Partition 18 18
Now we can manually edit the obtained picture.
Press right mouse button and select a subregion to edit.
To return to the complete picture select the option
p-graphs usually contain a lot of subtrees. The interesting
cases (marriages between relatives) are in the biconnected
parts - you can identify them using
or, simply by removing the subtrees by
Net/Transform/Reduction/Degree/All 2 Yes
We get a network on 840 vertices. Again there can be