Re: Assigning elements to a matrix

*To*: mathgroup at smc.vnet.net*Subject*: [mg47371] Re: [mg47358] Assigning elements to a matrix*From*: Sseziwa Mukasa <mukasa at jeol.com>*Date*: Wed, 7 Apr 2004 03:16:29 -0400 (EDT)*References*: <200404061036.GAA09276@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On Apr 6, 2004, at 6:36 AM, Mark Coleman wrote: > 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? > Assuming lst is of the form of your data: m=SparseArray[{#1,#2}->#3&@@@lst] Regards, Ssezi

**References**:**Assigning elements to a matrix***From:*Mark Coleman <mark@markscoleman.com>