docs: public static void add(ZMatrixD1 a , ZMatrixD1 b , ZMatrixD1 c )
      {
          if( a.numCols != b.numCols || a.numRows != b.numRows
                  || a.numCols != c.numCols || a.numRows != c.numRows ) {
              throw new IllegalArgumentException("The matrices are not all the same dimension.");
          }
  
          final int length = a.getDataLength();
  
          for( int i = 0; i < length; i++ ) {
              c.data[i] = a.data[i]+b.data[i];
          }
      }