graph_system_exists
PURPOSE 
graph_system_exists checks to see if the GRAPH_MAGIC global structure has
SYNOPSIS 
function tf = graph_system_exists
DESCRIPTION 
CROSS-REFERENCE INFORMATION 
This function calls:
This function is called by:
- free_all free_all --- delete all graphs from the GRAPH_MAGIC system
- graph_init graph_init(capacity) --- used to initialize the GRAPH_MAGIC data
- max_available num_available --- maximum number of graphs we can hold in this system
- num_available num_available --- number of free slots in the graph system
- set_large set_large(n) --- set the cut off size for large graphs.
SOURCE CODE 
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