Description of hasxy

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hasxy

PURPOSE

hasxy(g) --- determine if an embedding has been created for g

SYNOPSIS

function yn = hasxy(g)

DESCRIPTION

 hasxy(g) --- determine if an embedding has been created for g

CROSS-REFERENCE INFORMATION

This function calls:

• nv nv(g) --- number of vertices in g
• size size(g) --- returns [nv,ne] for the graph

This function is called by:

• bfstree bfstree(t,g,v) --- create a breadth-first spanning tree of g
• cartesian cartesian(g,h1,h2) --- overwrite g with the product of h1 and h2
• cdraw cdraw(g,coloring) -- draw g with a given vertex coloring
• delete delete --- delete vertices or edges from a graph
• dfstree dfstree(t,g,v) --- create a depth-first spanning tree of g
• disjoint_union disjoint_union(g,h,k) --- overwrite g with the disjoint union of the
• distxy distxy(g) -- give g a distance based embedding
• draw draw(g) --- draw g in a figure window
• getxy getxy(g) --- give g's embedding (or [] if g doesn't have one)
• graffle graffle(g, filename, width, rad) --- write graph in OmniGraffle format
• induce induce --- create induced subgraphs
• join join(g,h1,h2) --- overwrite g with the join of h1 and h2
• line_graph line_graph(g,h) --- set g to be the line graph of h
• path path(g,n) --- make g a path on n vertices
• renumber renumber the vertices of a graph
• resize resize(g,n) --- change the number of vertices in g to n
• rmxy rmxy(g) --- erase g's embedding
• save save(g,filename) --- save a graph to disk
• scale scale(g,s) --- rescale the embedding of g by s
• sgf sgf --- simple graph format: a 2-column matrix representation
• springxy springxy(g) --- find a spring embedding of g

SOURCE CODE

0001 function yn = hasxy(g)
0002 % hasxy(g) --- determine if an embedding has been created for g
0003 
0004 global GRAPH_MAGIC;
0005 
0006 n = nv(g);
0007 
0008 if isfield(GRAPH_MAGIC.graphs{g.idx},'xy')
0009     % the field exsts. now is is the right size?
0010     [nr,nc] = size(GRAPH_MAGIC.graphs{g.idx}.xy);
0011     if (nr == n) & (nc == 2)
0012         yn = 1;
0013         return
0014     else
0015         yn = 0;
0016         GRAPH_MAGIC.graphs{g.idx} = ...
0017             rmfield(GRAPH_MAGIC.graphs{g.idx},'xy');
0018         return
0019     end
0020 end
0021 yn = 0;

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