code: @Override
      public DMatrixRMaj getA() {
          if( A.data.length < numRows*numCols ) {
              A = new DMatrixRMaj(numRows,numCols);
          }
          A.reshape(numRows,numCols, false);
          CommonOps_DDRM.mult(Q,R,A);
  
          return A;
      }
docs: Compute the A matrix from the Q and R matrices.
  
  @return The A matrix.