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Energy(1)

Synopsis

Energy [-ghmvV] [--in] [--pb] [--rg] [--aa=<selection>] [--ac=<selection>] [--ac2=<selection>] [--acRes=<selection>] [--acRes2=<selection>] [--dc=0. _ 0_] [--ec=0.0] [--fl=0] [--ia=<selection>] [-l=-1] [--np=1] [--pd=<dihedralAtoms>] [--sf=1.0] [--uaA=-1] [--uaB=-1] [--uc=<selection>] [--uc2=<selection>] file…​

Description

Compute the force field potential energy.

Options

--dc, --densityCutoff=0.0
Create ARC file of structures above a specified density.
--ec, --energyCutoff=0.0
Create ARC file of structures within a specified energy of the lowest energy structure.
--fl, --findLowest=0
Return the n lowest energies from an ARC/PDB file.
-g, --gradient
Compute the atomic gradient as well as energy.
-h, --help
Print command help and exit.
--in, --inertia
Print out the moments of inertia.
-m, --moments
Print out electrostatic moments.
--pb, --printBondedTerms
Print all bonded energy terms.
--pd, --printDihedral=<dihedralAtoms>
Atom indices to print dihedral angle values.
--rg, --gyrate
Print out the radius of gyration.
-v, --verbose
Print out all energy components for each snapshot.
-V, --version
Print the Force Field X version and exit.

Atom Selection Options

--aa, --active=<selection>
Ranges of active atoms [NONE, ALL, Range(s): 1-3,6-N].
--ia, --inactive=<selection>
Ranges of inactive atoms [NONE, ALL, Range(s): 1-3,6-N].

Alchemical Options

--ac, --alchemicalAtoms=<selection>
Specify alchemical atoms [ALL, NONE, Range(s): 1-3,6-N].
--acRes, --alchemicalResidues=<selection>
Specify alchemical residues by chain and residue number [A4,B21]
-l, --lambda=-1
Initial lambda value.
--uc, --unchargedAtoms=<selection>
Specify atoms without electrostatics [ALL, NONE, Range(s): 1-3,6-N].

Alchemical Options for Dual and Quad Topologies

--ac2, --alchemicalAtoms2=<selection>
Specify alchemical atoms for the 2nd topology [ALL, NONE, Range(s): 1-3,6-N].
--acRes2, --alchemicalResidues2=<selection>
Specify alchemical residues by chain and residue number for the 2nd topology [A4,B21]
--np, --nParallel=1
Number of topologies to evaluate in parallel
--sf, --switchingFunction=1.0
Switching function to use for dual topology: options are TRIG, MULT, or a number (original behavior with specified lambda exponent)
--uaA, --unsharedA=-1
Unshared atoms in the A dual topology (e.g. 1-24.32-65).
--uaB, --unsharedB=-1
Unshared atoms in the B dual topology (e.g. 1-24.32-65).
--uc2, --unchargedAtoms2=<selection>
Specify atoms without electrostatics for the 2nd topology [ALL, NONE, Range(s): 1-3,6-N].

Arguments

file…​
The atomic coordinate file in PDB or XYZ format.