code: public T transpose() {
          T ret = createMatrix(mat.getNumCols(),mat.getNumRows(), mat.getType());
  
          ops.transpose(mat,ret.mat);
  
          return ret;
      }
docs: <p>
  Returns the transpose of this matrix.<br>
  a<sup>T</sup>
  </p>
  
  @see CommonOps_DDRM#transpose(DMatrixRMaj, DMatrixRMaj)
  
  @return A matrix that is n by m.