Method matrixQ

Eigen/src/SparseQR/SparseQR.h:173–174

\returns an expression of the matrix Q as products of sparse Householder reflectors. * The common usage of this function is to apply it to a dense matrix or vector * \code * VectorXd B1, B2; * // Initialize B1 * B2 = matrixQ() * B1; * \endcode * * To get a plain SparseMatrix representation of Q: * \code * SparseMatrix Q; * Q = SparseQR<SparseMatr

    * them before performing the product.
    */
    SparseQRMatrixQReturnType<SparseQR> matrixQ() const 
    { return SparseQRMatrixQReturnType<SparseQR>(*this); }
    
    /** \returns a const reference to the column permutation P that was applied to A such that A*P = Q*R
      * It is the combination of the fill-in reducing permutation and numerical column pivoting.