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sparse array consultation

• To: mathgroup at smc.vnet.net
• Subject: [mg102220] sparse array consultation
• From: Francisco Gutierrez <fgutiers2002 at yahoo.com>
• Date: Sat, 1 Aug 2009 04:03:37 -0400 (EDT)

Dear Sirs:
I have a code that must take several inverses from relatively big matrices 
the majority of whose entries are zeroes. It runs hellishly slowly.
 
I am aware that I sholud use sparse array functionalities to make these inverses run faster, but do not know quite how to use them. Can somebody help me?
Fg