ModelParam

class ModelParam

Model parameters depend upon site types, such as epsilon, sigma, etc. These parameters may also be mixed between two different site types. Each model parameter has an assumed mixing behavior.

Subclassed by feasst::Charge, feasst::CosPatchAngle, feasst::CutOff, feasst::EnergyAtCutoff, feasst::EnergyDerivAtCutoff, feasst::Epsilon, feasst::PatchAngle, feasst::Sigma

Public Functions

void add(const double value)

Add a new site type.

void set(const int site_type, const double value)

Set the value of the site type.

void add(const Site site, const double default_value = 0)

Add a new site type. If the site does not contain the model parameter, then add the default value.

void add(const Particle particle)

Add all site types in particle.

void mix()

Compute the mixed values.

void set_mixed(const int site_type1, const int site_type2, const double value)

Set the mixed value of the site types.

double value(const int type) const

Return the value.

const std::vector<double> &values() const

Return the values.

double mixed_value(const int type1, const int type2) const

Return the mixed value.

const std::vector<std::vector<double>> &mixed_values() const

Return the mixed values.

int size() const

Return the number of values.

std::string name() const

Return the name of the model parameter (e.g., epsilon, cutoff)

double max() const

Return the maximum.

double mixed_max() const

Return the mixed maximum.

virtual void set_param(const ModelParams &existing)

Define new parameters modeled after the existing ones.

ModelParam &set_name(const std::string name)

Set the name of the model parameter.

std::string str() const

Return as a human readable string.

class Epsilon : public feasst::ModelParam

The epsilon parameter is named “epsilon” in LMP-like data file Pair Coeffs. The epsilon parameter has the mixing rule: \( \epsilon_{ij} = \sqrt(\epsilon_i \epsilon_j) \)

class Sigma : public feasst::ModelParam

The sigma parameter is named “sigma” in LMP-like data file Pair Coeffs. The sigma parameter has the mixing rule: \( \sigma_{ij} = 0.5*(\sigma_i + \sigma_j) \)

class CutOff : public feasst::ModelParam

The cut off parameter is named “cutoff” in LMP-like data file Pair Coeffs. The cut off parameter has the mixing rule: \( r^c_{ij} = 0.5*(r^c_i + r^c_j)\)

class Charge : public feasst::ModelParam

The charge parameter is named “charge” in LMP-like data file Pair Coeffs. The charge parameter, q, has the mixing rule: \( q_{ij} = q_i q_j \)

class ModelParams : public feasst::PropertiedEntity

Container for all model parameters.

Public Functions

ModelParams(const ModelParams &params)

Deep copy constructor.

void add(const Site site)

Add all properties in site.

void add(const Particle particle)

Add all site types in particle.

void mix()

Compute the mixed values.

int size() const

Return the number of values.

void set(const std::string name, const int site_type, const double value)

Modify model parameter of a given site type and name to value.

void set(const std::string name, const int site_type1, const int site_type2, const double value)

Modify the mixed model parameter of a pair of given site types and name to value.

const Epsilon &epsilon() const

Return model parameters of specific types.

const std::vector<std::vector<double>> &mixed_epsilon() const

Return constant pointers for optimized model inner loops.

void add(std::shared_ptr<ModelParam> param)

Add a custom model parameter.

const std::shared_ptr<ModelParam> select(const std::string name) const

Return the model parameter with the corresponding name.

void set_cutoff_min_to_sigma()

Set the minimum cutoff to sigma. This is used for HardSphere potentials that don’t assign cutoff.

void set_physical_constants(std::shared_ptr<PhysicalConstants> constants = std::make_shared<CODATA2018>())

Set the physical constants.

const PhysicalConstants &physical_constants() const

Return the physical constants.

const PhysicalConstants &constants() const

Return the physical constants.

void check() const

Check.

std::string str() const

Return as a human readable string.