RPMDMonteCarloBarostat

class openmm.openmm.RPMDMonteCarloBarostat(*args)

This class is very similar to MonteCarloBarostat, but it is specifically designed for use with RPMDIntegrator. For each trial move, it scales all copies of the system by the same amount, then accepts or rejects the move based on the change to the total energy of the ring polymer (as returned by the integrator’s getTotalEnergy() method).

__init__(self, defaultPressure, frequency=25) → RPMDMonteCarloBarostat

__init__(self, other) → RPMDMonteCarloBarostat

Create a MonteCarloBarostat.

Parameters

• defaultPressure (double) – the default pressure acting on the system (in bar)

• frequency (int) – the frequency at which Monte Carlo pressure changes should be attempted (in time steps)

Methods

Pressure()	This is the name of the parameter which stores the current pressure acting on the system (in bar).
__init__(-> RPMDMonteCarloBarostat)	Create a MonteCarloBarostat.
getDefaultPressure(self)	Get the default pressure acting on the system (in bar).
getForceGroup(self)	Get the force group this Force belongs to.
getFrequency(self)	Get the frequency (in time steps) at which Monte Carlo pressure changes should be attempted.
getName(self)	Get the name of this Force.
getRandomNumberSeed(self)	Get the random number seed.
setDefaultPressure(self, pressure)	Set the default pressure acting on the system.
setForceGroup(self, group)	Set the force group this Force belongs to.
setFrequency(self, freq)	Set the frequency (in time steps) at which Monte Carlo pressure changes should be attempted.
setName(self, name)	Set the name of this Force.
setRandomNumberSeed(self, seed)	Set the random number seed.
usesPeriodicBoundaryConditions(self)	Returns whether or not this force makes use of periodic boundary conditions.

Attributes

thisown

The membership flag

property thisown

The membership flag

static Pressure() → std::string const &

This is the name of the parameter which stores the current pressure acting on the system (in bar).

getDefaultPressure(self) → double

Get the default pressure acting on the system (in bar).

Returns

the default pressure acting on the system, measured in bar.

Return type

double

setDefaultPressure(self, pressure)

Set the default pressure acting on the system. This will affect any new Contexts you create, but not ones that already exist.

Parameters

pressure (double) – the default pressure acting on the system, measured in bar.

getFrequency(self) → int

Get the frequency (in time steps) at which Monte Carlo pressure changes should be attempted. If this is set to 0, the barostat is disabled.

setFrequency(self, freq)

Set the frequency (in time steps) at which Monte Carlo pressure changes should be attempted. If this is set to 0, the barostat is disabled.

getRandomNumberSeed(self) → int

Get the random number seed. See setRandomNumberSeed() for details.

setRandomNumberSeed(self, seed)

Set the random number seed. It is guaranteed that if two simulations are run with different random number seeds, the sequence of Monte Carlo steps will be different. On the other hand, no guarantees are made about the behavior of simulations that use the same seed. In particular, Platforms are permitted to use non-deterministic algorithms which produce different results on successive runs, even if those runs were initialized identically.

If seed is set to 0 (which is the default value assigned), a unique seed is chosen when a Context is created from this Force. This is done to ensure that each Context receives unique random seeds without you needing to set them explicitly.

usesPeriodicBoundaryConditions(self) → bool

Returns whether or not this force makes use of periodic boundary conditions.

Returns

true if force uses PBC and false otherwise

Return type

bool

getForceGroup(self) → int

Get the force group this Force belongs to.

getName(self) → std::string const &

Get the name of this Force. This is an arbitrary, user modifiable identifier. By default it equals the class name, but you can change it to anything useful.

setForceGroup(self, group)

Set the force group this Force belongs to.

Parameters

group (int) – the group index. Legal values are between 0 and 31 (inclusive).

setName(self, name)

Set the name of this Force. This is an arbitrary, user modifiable identifier. By default it equals the class name, but you can change it to anything useful.