# file

WrightFisherCoeffPolicy.hWright-Fisher coefficients policies.

### Contents

- Reference

This file defines coefficients policy classes for the Wright-Fisher SDE, defined in DiffEq/

General requirements on the Wright-Fisher SDE coefficients policy classes:

- Must define a
*constructor*, which is used to initialize the SDE coefficient vector, omega. Required signature:CoeffPolicyName( tk::ctr::ncomp_type ncomp, const std::vector< kw::sde_omega::info::expect::type >& omega_, std::vector< kw::sde_omega::info::expect::type >& omega )

where

- ncomp denotes the number of scalar components of the system of the Wright-Fisher SDE.
- Constant references to omega_ which denote a vector of real values used to initialize the parameter vector of the Wright-Fisher SDE. The length of the vector must be equal to the number of components given by ncomp.
- Reference to omega which denote the parameter vector to be initialized based on omega_.

Must define the static function

*type()*, returning the enum value of the policy option. Example:static ctr::CoeffPolicyType type() noexcept { return ctr::CoeffPolicyType::CONST_COEFF; }

which returns the enum value of the option from the underlying option class, collecting all possible options for coefficients policies.

## Namespaces

- namespace walker
- Walker declarations and definitions.

## Classes

- class walker::WrightFisherCoeffConst
- Wright-Fisher constant coefficients policity: constants in time.