Half cosine activation function. More...

#include <ActivationFunction.h>

Inheritance diagram for HalfCosineActivation:

Public Member Functions
	HalfCosineActivation (double cardiac_period)
	Construct with default parameter values (loader fills via set_param).

double	compute (double time) override
	Compute activation value at given time.

Public Member Functions inherited from ActivationFunction
	ActivationFunction (double cardiac_period, const std::vector< std::pair< std::string, InputParameter > > &input_param_properties)
	Construct activation function.

virtual	~ActivationFunction ()=default
	Virtual destructor.

void	set_param (const std::string &name, double value)
	Set a scalar parameter value by name.

virtual void	finalize ()
	Called after all parameters are set (e.g. by loader).

Additional Inherited Members
Static Public Member Functions inherited from ActivationFunction
static std::unique_ptr< ActivationFunction >	create_default (const std::string &type_str, double cardiac_period)
	Create a default activation function from activation function type.

Public Attributes inherited from ActivationFunction
const std::vector< std::pair< std::string, InputParameter > >	input_param_properties
	Properties of the input parameters for this activation function [(name, InputParameter), ...].

Protected Attributes inherited from ActivationFunction
double	cardiac_period_
	Time duration of one cardiac cycle.

std::map< std::string, double >	params_
	Map of parameter names to their values.

Detailed Description

Half cosine activation function.

This implements the activation function used in the original ChamberElastanceInductor. The activation follows a half cosine wave during the contraction period.

$A(t) = \begin{cases} -\frac{1}{2}\cos(2\pi t_{contract}/t_{twitch}) + \frac{1}{2}, & \text{if } t_{contract} \le t_{twitch} \\ 0, & \text{otherwise} \end{cases}$