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sparse matrix question

• To: mathgroup at smc.vnet.net
• Subject: [mg56128] sparse matrix question
• From: Ted Sariyski <tsariysk at craft-tech.com>
• Date: Sat, 16 Apr 2005 03:52:10 -0400 (EDT)
• References: <d3lrsq$sef$1@smc.vnet.net> <200504150847.EAA11518@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

I have a list
l={{a,b},{c,d},{e,f}}
and a list of pointers  to the non-zero columns of a 
sparse matrix e.g. p={3,4,6}:
      
      | 0 0 a c 0 d 0 ... |
m=    |                   |
      | 0 0 b d 0 e 0 ... |

What is the best way to do this? How can I address a column in 
mathematica?

Thanks,
Ted

• Follow-Ups:
  • Re: sparse matrix question
    • From: DrBob <drbob@bigfoot.com>

• References:
  • Re: Wierd problems with Mathematica - inversion of a 12x12 matrix
    • From: David Bailey <dave@Remove_Thisdbailey.co.uk>