code: public Double getReal(int m, int n)
      {
          IndexMN i = new IndexMN(m,n);
          if ( real.containsKey(i) )
          {
              return real.get(i);
          }
          return new Double(0);
      }
docs: /* (non-Javadoc)
  @see com.paradigmdesigner.matlab.types.MLNumericArray#getReal(int, int)