[jira] Created: (HAMA-134) We don't need to fill C with zeros

[Edward J. Yoon (JIRA)]

We don't need to fill C with zeros
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                 Key: HAMA-134
                 URL: https://issues.apache.org/jira/browse/HAMA-134
             Project: Hama
          Issue Type: Sub-task
            Reporter: Edward J. Yoon


Also, let's create/use/return the 'new SubMatrix' directly.

----
 public SubMatrix mult(SubMatrix b) {
   double[][] C = new double[this.getRows()][b.getColumns()];
   for (int i = 0; i < this.getRows(); i++) {
     Arrays.fill(C[i], 0);
   }

   for (int i = 0; i < this.getRows(); i++) {
     for (int j = 0; j < b.getColumns(); j++) {
       for (int k = 0; k < this.getColumns(); k++) {
         C[i][j] += this.get(i, k) * b.get(k, j);
       }
     }
   }

   return new SubMatrix(C);

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