Abstract

Here, we consider two important classes of unconstrained optimization methods: conjugate gradient methods and trust region methods. These two classes of methods are very interesting; it seems that they are never out of date. First, we consider conjugate gradient methods. We also illustrate the practical behavior of some conjugate gradient methods. Then, we study trust region methods. Considering these two classes of methods, we analyze some recent results.

Keywords: conjugate gradient method, hybrid conjugate gradient method, three-term conjugate gradient method, modified conjugate gradient method, trust region methods
