From: Chuck Brotman <brotman@...>
Date: 2010-06-22T04:41:49+09:00
Subject: Re: General Confusion

Robert,

Thanks for your response!
You wrote:

"You need to have the node created before you add it if you want to keep
direct references.  I'd say that is pretty much straightforward.  Note
that you do not need to create *all* nodes before you start creating
edges.

If you implement your graph in a way so nodes have ids (say integers)
you could use those for referencing other nodes.  But then you also need
some mechanism to record which nodes are there, i.e. you could create
another class Graph which holds that information.

"

Please help me better understand this.
1) Direct references vs ???  Pleas elaborate on the alternative(s)
2) When you say "you do not need to create *all* nodes before you start 
creating edges." I assume that you mean I can create an edge as soon as 
the end nodes for that edge have been created, even if other edges are 
still non-existant.  Do I understand that correctly?
3)I expected that I would nee to create a class "Graph" so I think I'm 
in sync with your second paragraph

Sometimes I look at this stuff and it seems "so obvious". Then, I try to 
implement it and it no longer seems so....  :(


Thanks again,
Chuck


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