[igraph] igraph network coordinates with constraints?

[James T Metz]

Igraph Users,

        Is
it possible to use the R igraph code and generate a network where some
of the coordinates
of nodes are constrained and other nodes
are unconstrained?

        For
example, I have a set of 10 objects with distance (or similarity) information
for those 
objects.  I generate a network
and coordinates for those 10 objects.  I now have a new object.  I
can
re-calculate a new distance (similarity)
matrix for all 11 objects.

        However,
if possible, I would like to preserve the original network and coordinates
of the 
previous 10 objects, and I want to add
the 11th object onto the previous network in the most optimal
position for that 11th object only.

        Is
this possible? If so, can someone provide some R code as a simple example.

        Also,
since the network generation is stochastic, again it is important the the
original
network be generated with the same coordinates
each time (if possible).

        Thank
you.

        Regards,
        Jim
Metz


James T. Metz, Ph.D.
Senior Scientist III Chemistry

GPRD R4DG AP52 - 01D10P
Abbott Laboratories
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