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https://issues.apache.org/jira/browse/HAMA-13?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edward J. Yoon updated HAMA-13:
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Description:
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
was: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.
however, matrix multiplication is quite another story.
> Scalar and Matrix Multiplication
> ---------------------------------
>
> Key: HAMA-13
> URL: https://issues.apache.org/jira/browse/HAMA-13
> Project: Hama
> Issue Type: Improvement
> Components: algorithm
> Reporter: Edward J. Yoon
>
> 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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