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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HAMA-11) Adding and Subtracting Matrices
Date Tue, 29 Jul 2008 09:52:31 GMT
Adding and Subtracting Matrices
-------------------------------

                 Key: HAMA-11
                 URL: https://issues.apache.org/jira/browse/HAMA-11
             Project: Hama
          Issue Type: Improvement
          Components: algorithm
            Reporter: Edward J. Yoon


Matrix addition/subtraction is fairly simple, and is done entry-wise. For instance:

If Matrix A = {[a, b], [c, d]}, Matrix B = {[e, f], [g, h]},

A + B

Add the pairs of entries, and simplify for the final answer:

{[a, b], [c, d]} + {[e, f], [g, h]} = {[a + e, b + f], [c + g, d + h]}

So, we can solve this using the mapreduce by 1D row-wise partitioning.

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