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From Apache Wiki <wikidi...@apache.org>
Subject [Hama Wiki] Trivial Update of "Architecture" by udanax
Date Mon, 16 Mar 2009 02:17:22 GMT
Dear Wiki user,

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The following page has been changed by udanax:
http://wiki.apache.org/hama/Architecture

------------------------------------------------------------------------------
  - Reduce task select the maximum one
  }}}
  
+ === Compute the transpose of a matrix ===
+ 
+ The transpose of a matrix is another matrix in which the rows and columns have been reversed.
The matrix must be square for this work.
+ 
+ {{{
+ +             +    +             +
+ | a11 a12 a13 |    | a11 a21 a31 |
+ | a21 a22 a23 | => | a12 a22 a32 |
+ | a31 a32 a33 |    | a13 a23 a33 |
+ +             +    +             +
+ 
+ - A map task receives a row n as a key, and vector of each row as its value
+  - emit (Reversed index, the entry with the given index)
+ 
+ ex) row = 1, { 1: a11, 2: a12, 3: a13}
+ 
+ a11, a11
+ a21, a12
+ a31, a13
+ ...
+ 
+ - Reduce task sets the reversed values
+ }}}
+ 
+ 
  === Compute the determinant of matrix ===
  
   * http://issues.apache.org/jira/browse/HAMA-66

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