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https://issues.apache.org/jira/browse/HAMA-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249554#comment-15249554
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ASF GitHub Bot commented on HAMA-13:
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Github user edwardyoon closed the pull request at:
https://github.com/apache/incubator-horn/pull/15
> Scalar and Matrix Multiplication
> ---------------------------------
>
> Key: HAMA-13
> URL: https://issues.apache.org/jira/browse/HAMA-13
> Project: Hama
> Issue Type: Improvement
> Components: math
> Reporter: Edward J. Yoon
> Assignee: Edward J. Yoon
> Attachments: HAMA-13.patch
>
>
> There are two types of multiplication for matrices: scalar multiplication and
> matrix multiplication. Scalar multiplication is easy. You just take a number
> (called a "scalar") and multiply it on every entry in the matrix. For example,
> For the following matrix A, find 2A :
> 2A = 2- {[a, b], [c, d]} = {[2- a, 2- b], [2- c, - d]}
> however, matrix multiplication is quite another story. We need to multiply
> the ROWS of A by the COLUMNS of B. By this I mean that I first take the first
> row of A and the first column of B, and we multiply the first entries, then
> the second entries, and then the third entries, and then we add the three
> products. The sum is one entry in the product matrix AB.
> reference : http://carbon.cudenver.edu/csprojects/CSC5809S01/Simd/parmult.html
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