Re: Mathematica, Graph Theory
- To: mathgroup at smc.vnet.net
- Subject: [mg83345] Re: Mathematica, Graph Theory
- From: mumat <csarami at gmail.com>
- Date: Sat, 17 Nov 2007 05:40:44 -0500 (EST)
- References: <fhh8r9$9ge$1@smc.vnet.net>
This is interesting. It shows that how confusing it can be Mathematica
when it comes to Discrete Mathematics. I think this is quite serious!
Not everyone is into Integration and Calculus these days. I urge
Mathematica folks seriously take a look at Combinatorics/Discrete
Mathematics.
Part of the confusion is from the new GraphPlot function which is
awesome by the way as a graphical tool!!! gIt is nothing but a graph
drawing package! It creat such a pretty graph. But on the other hand,
has it's own data structure {v_i->v_j}.
Can someone explain to us that why a vertex should have Number
attribute, when we have Label and Weight attributes!!
I think the VertexNumber is the one that creats the problem. When you
use DeleteVertices[h,{1,2}], it reconstruct a new graph with vertices
starting from 1,2,3... That's why
In[101]:= g = DeleteVertices[h, {1, 2}]
Graph:<1,2,Undirected>
DeleteVertices[g, {1, 2}]
Out[102]= Graph:<0,0,Undirected>
Which is an empty graph! Strange!!
I am guessing Wolfram folks are working on it! to unify the
combinatorics package!