Research from all publishers Recent investigations have enhanced the performance and convergence properties of conjugate gradient methods. For example, modifications to the classical algorithms ...

Main results: the investigation of conjugate gradient method properties is replaced by the investigation of some approximation problems; a rate of convergence is characterized by a Jacobi matrix ...

The examples in these areas demonstrate promise for the new acceleration method. In terms of operation counts, for all of the examples considered the accelerated EM algorithm increases the speed of ...

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