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sparse matrix question


I have a list
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 


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