Nonrecursive Equivalent of the Conjugate Gradient Method without the Need to Restart

Algorithm 1

Basic IRM algorithm.

Require: , , , ε, {usually }
Ensure: {close to }
(1)	{initialisation: steepest descent}
(2)
(3)
(4)
(5)	while do {iterated Ritz method}
(6)
(7)
(8)	generate
(9)
(10)
(11)
(12)
(13)
(14)	end while {end iterated Ritz method}