Abstract. We consider a new hybrid conjugate gradient algorithm, which is obtained from the algorithm of Fletcher-Reeves, and the algorithm of Polak-Ribière-Polyak. Numerical comparisons show that the ...

Here we propose an alternative method based on conjugate gradients. The key, as we show, is that the EM step can be viewed (approximately at least) as a generalized gradient, making it natural to ...

Conjugate gradient methods form a class of iterative algorithms that are highly effective for solving large‐scale unconstrained optimisation problems.