Syntax:
min_style style
Examples:
min_style cg min_style sd
Description:
Choose a minimization algorithm to use when a minimize command is performed.
Style cg is the Polak-Ribiere (PR) version of the conjugate gradient (CG) algorithm. At each iteration the force gradient is combined with the previous iteration information to compute a new search direction perpendicular (conjugate) to previous search directions. The PR variant affects how the direction is chosen and how the CG method is restarted when it ceases to make progress. The PR variant is thought to be the most effective CG choice.
Style cg/fr is the Fletcher-Reeves version of the conjugate gradient algorithm.
Style sd is a steepest descent algorithm. At each iteration, the downhill direction corresponding to the force vector (negative gradient of energy) is searched along by a 1d line search. Typically, steepest descent will not converge as quickly as CG, but may be more robust in some situations.
Restrictions: none
Related commands:
Default:
min_style cg