assignment of matrix elements
- To: mathgroup at smc.vnet.net
- Subject: [mg17206] assignment of matrix elements
- From: "Richard Finley" <rfinley at medicine.umsmed.edu>
- Date: Mon, 26 Apr 1999 01:20:45 -0400
- Sender: owner-wri-mathgroup at wolfram.com
This seems like it should be straightforward but I am too tired to think
about it anymore:
If you have a matrix say mat = Array[m, {4,4}]
and a list of indices say v = {{1,2},{1,3},{2,3},{3,1}}
with another list of the same length giving the values of the matrix
elements at
those indices: w = {1,5,-2,1}
How do you assign values to the matrix elements with those values...ie
so
that m[1,2]=1, m[1,3]=5 etc...
Obviously you can do it individually by simple assignment:
m{1,2]=1
That won't work for me because there are thousands of elements...the
techniques I have tried so far
have not worked...any help is greatly appreciated.
Thanks
Richard Finley