Description of join

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join

PURPOSE

join(g,h1,h2) --- overwrite g with the join of h1 and h2

SYNOPSIS

function join(g,h1,h2)

DESCRIPTION

 join(g,h1,h2) --- overwrite g with the join of h1 and h2

CROSS-REFERENCE INFORMATION

This function calls:

• embed embed --- create an embedding for a graph
• getxy getxy(g) --- give g's embedding (or [] if g doesn't have one)
• hasxy hasxy(g) --- determine if an embedding has been created for g
• nv nv(g) --- number of vertices in g
• rmxy rmxy(g) --- erase g's embedding

This function is called by:

SOURCE CODE

0001 function join(g,h1,h2)
0002 % join(g,h1,h2) --- overwrite g with the join of h1 and h2
0003 
0004 global GRAPH_MAGIC
0005 
0006 n1 = nv(h1);
0007 n2 = nv(h2);
0008 
0009 z = logical(ones(n1,n2));
0010 
0011 rmxy(g);
0012 
0013 
0014 GRAPH_MAGIC.graphs{g.idx}.array = ...
0015     [GRAPH_MAGIC.graphs{h1.idx}.array, z; ...
0016      z', GRAPH_MAGIC.graphs{h2.idx}.array
0017     ];
0018 
0019 
0020 if (hasxy(h1) & hasxy(h2))
0021     xy = [getxy(h1);getxy(h2)];
0022     embed(g,xy);
0023 end

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