Hi,

I'm using graph tool to represent a mesh of apical junctions
(interconnected cells in a tissue). As my simulation goes, positions of
the graph nodes change. Positions are stored as 3 vertex property maps
with type <double> (i.e. x, y and z). For now, I write a graphxml file
(plus possibliy a .png image of the graph) each time I change the nodes
positions.

I would like to store the history of each node position, in other terms
its trajectory, but I feel that doing so by assigning a property map
with type vector<double> to each node would produce big files: I
typically have about 5000 vertices, and up to 350 'time points'. I would
also need to store other propery maps (describing each vertex and edge
state in the simulation). A full static view right now gives a 24 Mb xml
file...

The point is I usually only need the static version, which I tend to
open and close quite often, and that allready takes quite some time to
open. So I thought I could for exemple store the graph's history in a
separate h5 file and access only if needed, for exemple, and only store
a reference to the file in the graph.

I'd really apreciate to have some insight into that before I go on coding...

Cheers,

Guillaume
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