Source code for BioSimSpace.Protocol._minimisation

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# BioSimSpace: Making biomolecular simulation a breeze!
#
# Copyright: 2017-2023
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# Authors: Lester Hedges <lester.hedges@gmail.com>
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# BioSimSpace is free software: you can redistribute it and/or modify
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"""Functionality for minimisation protocols."""

__author__ = "Lester Hedges"
__email__ = "lester.hedges@gmail.com"

__all__ = ["Minimisation"]

import warnings as _warnings

from .. import Units as _Units

from ._position_restraint_mixin import _PositionRestraintMixin
from ._protocol import Protocol as _Protocol


[docs] class Minimisation(_Protocol, _PositionRestraintMixin): """A class for storing minimisation protocols."""
[docs] def __init__( self, steps=10000, restraint=None, force_constant=10 * _Units.Energy.kcal_per_mol / _Units.Area.angstrom2, ): """ Constructor. Parameters ---------- steps : int The maximum number of steps to perform. restraint : str, [int] The type of restraint to perform. This should be one of the following options: "backbone" Protein backbone atoms. The matching is done by a name template, so is unreliable on conversion between molecular file formats. "heavy" All non-hydrogen atoms that aren't part of water molecules or free ions. "all" All atoms that aren't part of water molecules or free ions. Alternatively, the user can pass a list of atom indices for more fine-grained control. If None, then no restraints are used. force_constant : :class:`GeneralUnit <BioSimSpace.Types._GeneralUnit>`, float The force constant for the restraint potential. If a 'float' is passed, then default units of 'kcal_per_mol / angstrom**2' will be used. """ # Call the base class constructor. _Protocol.__init__(self) _PositionRestraintMixin.__init__(self, restraint, force_constant) # Set the number of steps. self.setSteps(steps)
def _get_parm(self): """Return a string representation of the parameters.""" return f"steps={self._steps}, " + _PositionRestraintMixin._get_parm(self) def __str__(self): """Return a human readable string representation of the object.""" if self._is_customised: return "<BioSimSpace.Protocol.Custom>" else: return f"<BioSimSpace.Protocol.Minimisation: {self._get_parm()}>" def __repr__(self): """Return a string showing how to instantiate the object.""" if self._is_customised: return "BioSimSpace.Protocol.Custom" else: return f"BioSimSpace.Protocol.Minimisation({self._get_parm()})" def __eq__(self, other): """Equality operator.""" if not isinstance(other, Minimisation): return False if self._is_customised or other._is_customised: return False return self._steps == other._steps and _PositionRestraintMixin.__eq__( self, other )
[docs] def getSteps(self): """ Return the maximum number of steps. Returns ------- steps : int The maximum number of minimisation steps. """ return self._steps
[docs] def setSteps(self, steps): """ Set the maximum number of steps. Parameters ---------- steps : int The maximum number of minimisation steps. """ if not type(steps) is int: raise TypeError("'steps' must be of type 'int'") if steps <= 0: _warnings.warn( "Number of steps must be greater than zero. Using default (10000)." ) self._steps = 10000 else: self._steps = steps