Sparse Array Question
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- Subject: [mg130578] Sparse Array Question
- From: christopher arthur <chris.arthur1 at gmail.com>
- Date: Tue, 23 Apr 2013 00:04:24 -0400 (EDT)
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Hello,
I have a list of rules for defining a SparseArray. The list has some
coordinates repeated with different values. If a coordinate appears in
the list more than once, I want to sum up the values, and then have a
SparseArray
i.e., if my list were myList={{1,1}->1,{2,1}->2,{1,1}->3} then my
SparseArray should have {1,1}->4. I've tried using ReplacePart on an
array to say myArray=ReplacePart[myArray,...] but this seems horribly
inefficient as a way to change values in an array.
I'm using Mathematica 5.2
Cheers,
Chris
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