Hi experts!!

I am studying the intersection between line 
segments (sticks). I have an Numpy array (M) corresponding to the 
intersection graph of the system (the element Mij = 1 if the sticks' i 
'and' 'j' intersect, and Mij = 0 if not intersect).

I want to 
determine the number of elements that form the path that connects two 
sticks (N and K), i.e.: the number of sticks that form the spanning 
cluster between stick N and K. 
How I can do?? Please explain step by step.

Best regards!

Thanks a lot.

José Luis
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