2006-09-22 00:22:34 +08:00
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"LAMMPS WWW Page"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
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:link(lws,http://lammps.sandia.gov)
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:link(ld,Manual.html)
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:link(lc,Chapter_commands.html#comm)
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:line
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min_style command :h3
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[Syntax:]
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min_style style :pre
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2008-04-15 05:37:10 +08:00
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style = {cg} or {sd} :ul
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2006-09-22 00:22:34 +08:00
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[Examples:]
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min_style cg
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min_style sd :pre
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[Description:]
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Choose a minimization algorithm to use when a "minimize"_minimize.html
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command is performed.
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2008-04-15 05:37:10 +08:00
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Style {cg} is the Polak-Ribiere version of the conjugate gradient (CG)
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algorithm. At each iteration the force gradient is combined with the
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previous iteration information to compute a new search direction
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perpendicular (conjugate) to the previous search direction. The PR
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2006-09-22 00:22:34 +08:00
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variant affects how the direction is chosen and how the CG method is
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restarted when it ceases to make progress. The PR variant is thought
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to be the most effective CG choice.
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Style {sd} is a steepest descent algorithm. At each iteration, the
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2008-04-15 05:37:10 +08:00
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search direction is set to the downhill direction corresponding to the
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force vector (negative gradient of energy). Typically, steepest
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descent will not converge as quickly as CG, but may be more robust in
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some situations.
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2006-09-22 00:22:34 +08:00
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[Restrictions:] none
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[Related commands:]
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"min_modify"_min_modify.html, "minimize"_minimize.html
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[Default:]
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min_style cg :pre
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