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Assigning elements to a matrix

• To: mathgroup at smc.vnet.net
• Subject: [mg47358] Assigning elements to a matrix
• From: Mark Coleman <mark at markscoleman.com>
• Date: Tue, 6 Apr 2004 06:36:57 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Greetings,

I need to create a series of n x n matrices, in both conventional and 
sparse matrix formats. I have a (large) table of lists, where each list 
is of the form:

{i,j,value}, where {i,j} are the row-column indices and value is the 
corresponding numerical value, i.e., m[[i,j]]=value.

Using this data I need to create an n x n matrix where all the values 
except those specified in my list are 0. I would also like to create a 
similar matrix, this time using Mathematica's built-in SpareMatrix format.

Can anyone suggest a way to do this?

Thanks,

-mark

• Follow-Ups:
  • Re: Assigning elements to a matrix
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: Assigning elements to a matrix
    • From: Sseziwa Mukasa <mukasa@jeol.com>