Options struct for multishift_qr(). More...

#include <FrancisOpts.hpp>

Inheritance diagram for tlapack::FrancisOpts:

Public Attributes
std::function< size_t(size_t, size_t)>	deflation_window_recommender
	Function that returns the number of shifts to use for a given matrix size.

int	n_aed = 0
	number of times AED was called

int	n_shifts_total = 0
	total number of shifts used

int	n_sweep = 0
	number of sweeps used

size_t	nibble = 14
	Threshold of percent of AED window that must converge to skip a sweep.

size_t	nmin = 75
	Threshold to switch between blocked and unblocked code.

std::function< size_t(size_t, size_t)>	nshift_recommender
	Function that returns the number of shifts to use for a given matrix size.

Detailed Description

Options struct for multishift_qr().

Member Data Documentation

◆ deflation_window_recommender

std::function<size_t(size_t, size_t)> tlapack::FrancisOpts::deflation_window_recommender

Initial value:

=
        [](size_t n, size_t nh) -> size_t {
        if (n < 30) return 2;
        if (n < 60) return 4;
        if (n < 150) return 10;
        if (n < 590) return size_t(n / std::log2(n));
        if (n < 3000) return 96;
        if (n < 6000) return 192;
        return 384;
    }

Function that returns the number of shifts to use for a given matrix size.

◆ nshift_recommender

std::function<size_t(size_t, size_t)> tlapack::FrancisOpts::nshift_recommender