diagSoftAbsMetric Class Reference

#include <diagSoftAbsMetric.h>

Inheritance diagram for diagSoftAbsMetric:

List of all members.

Public Member Functions
	diagSoftAbsMetric (int dim)
double	T ()
	Return the kinetic energy.
double	tau ()
	Return the quadratic form of the kinetic energy.
void	bounceP (const VectorXd &normal)
void	sampleP (Random &random)
void	setSoftAbsAlpha (double a)
	Set the SoftAbs regularization coefficient.
void	checkEvolution (const double epsilon=1e-6)
	Comparing the evolution implementations with finite differences.
void	displayState ()
	Display current state.
Protected Member Functions
virtual void	fComputeDiagH ()=0
	Compute the diagonal components of the Hessian at the current position.
virtual void	fComputeGradDiagH ()=0
	Compute the gradient of the diagonal Hessian.
void	fComputeMetric ()
void	fPrepareSpatialGradients ()
VectorXd &	dTaudp ()
	Gradient of the quadrtic form with respect to the momenta.
VectorXd &	dTaudq ()
	Gradient of the quadratic form with respect to the position.
VectorXd &	dPhidq ()
	Gradient of the psuedo-potential with respect to the momenta.
Protected Attributes
double	mSoftAbsAlpha
	Regularization coefficient.
VectorXd	mDiagH
	Diagonal components of the Hessian.
MatrixXd	mGradDiagH
	Gradient of the diagonal Hessian.
VectorXd	mLambda
	Inverse metric.
VectorXd	mGradHelper
	Auxiliary vector for intermeidate matrix calculations.

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Detailed Description

Author:

Michael Betancourt

Abstract base class defining the interface for a Hamiltonian defined on a Riemannian manifold with a diagonal approximation to the SoftAbs Metric

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Constructor & Destructor Documentation

diagSoftAbsMetric::diagSoftAbsMetric

(

int

dim

)

[explicit]

Constructor

Parameters:

dim	Dimension of the target space

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Member Function Documentation

void diagSoftAbsMetric::bounceP

(

const VectorXd &

normal

)

[virtual]

Evolve the momentum through a bounce off of a constraint surface

Parameters:

normal

Vector normal to constraint surface

Implements baseHamiltonian.

void diagSoftAbsMetric::checkEvolution

(

const double

epsilon = 1e-6

)

[virtual]

Comparing the evolution implementations with finite differences.

Compare the position and momentum evolution implementations with finite differences

Parameters:

epsilon

Size of finite difference step

Reimplemented from baseHamiltonian.

void diagSoftAbsMetric::fComputeMetric

(

)

[protected, virtual]

Compute the metric at the current position, performing an eigen decomposition and computing the log determinant

Implements dynamMetric.

void diagSoftAbsMetric::fPrepareSpatialGradients

(

)

[inline, protected, virtual]

Update any position-dependent auxiliary terms in preparation for spatial gradients

Reimplemented from dynamMetric.

void diagSoftAbsMetric::sampleP

(

Random &

random

)

[virtual]

Sample the momentum from the conditional distribution

Parameters:

random

External RandomLib generator

Implements baseHamiltonian.

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The documentation for this class was generated from the following files:

• base/diagSoftAbsMetric.h
• base/diagSoftAbsMetric.cpp