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GMX-PME_ERROR(1)		    GROMACS		      GMX-PME_ERROR(1)

NAME
       gmx-pme_error - Estimate	the error of using PME with a given input file

SYNOPSIS
	  gmx pme_error	[-s [<.tpr>]] [-o [<.out>]] [-so [<.tpr>]] [-beta <real>]
		       [-[no]tune] [-self <real>] [-seed <int>]	[-[no]v]

DESCRIPTION
       gmx  pme_error estimates	the error of the electrostatic forces if using
       the sPME	algorithm. The flag -tune will determine the splitting parame-
       ter such	that the error is equally distributed over the real and	recip-
       rocal space part.  The part of the error	that stems from	self  interac-
       tion  of	 the particles is computationally demanding. However, a	good a
       approximation is	to just	use a fraction of the particles	for this  term
       which can be indicated by the flag -self.

OPTIONS
       Options to specify input	files:

       -s [<.tpr>] (topol.tpr)
	      Portable xdr run input file

       Options to specify output files:

       -o [<.out>] (error.out)
	      Generic output file

       -so [<.tpr>] (tuned.tpr)	(Optional)
	      Portable xdr run input file

       Other options:

       -beta <real> (-1)
	      If positive, overwrite ewald_beta	from .tpr file with this value

       -[no]tune (no)
	      Tune the splitting parameter such	that the error is equally dis-
	      tributed between real and	reciprocal space

       -self <real> (1)
	      If  between  0.0	and 1.0, determine self	interaction error from
	      just this	fraction of the	charged	particles

       -seed <int> (0)
	      Random number seed used for Monte	Carlo algorithm	when -self  is
	      set to a value between 0.0 and 1.0

       -[no]v (no)
	      Be loud and noisy

SEE ALSO
       gmx(1)

       More	information    about	GROMACS	   is	 available    at    <-
       http://www.gromacs.org/>.

COPYRIGHT
       2025, GROMACS development team

2025.0				 Feb 10, 2025		      GMX-PME_ERROR(1)

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