Shell

Load      load the matrix from the matrix file using user specified !MapReduce class. 
          for example:
 
          hama> a = load "fileA" as Matrix using !MyMapReduce.class; 
          hama> b = load "fileB" as Matrix using !MyMapReduce.class;

Add      the matrix addition. 
          such as : 

          hama> c = a + b.

Multiply   the matrix multiplication. 
          such as : 

          hama> d = a * b.

Save      save the matrix as a file. 
          such as :
          
          hama> save c as "fileC".