A class that implements RMSD calculations This is a class that implements the various infrastructure to calculate the RMSD or MSD respect a given frame. More...

#include <RMSD.h>

Public Member Functions
	RMSD ()
	Constructor. More...

void	clear ()
	clear the structure More...

void	set (const PDB &, std::string mytype, bool remove_center=true, bool normalize_weights=true)
	set reference, align and displace from input pdb structure: evtl remove com from the initial structure and normalize the input weights from the pdb More...

void	set (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &reference, std::string mytype, bool remove_center=true, bool normalize_weights=true)
	set align displace reference and type from input vectors More...

void	setType (std::string mytype)
	set the type of alignment we are doing More...

void	setReference (const std::vector< Vector > &reference)
	set reference coordinates, remove the com by using uniform weights More...

void	setAlign (const std::vector< double > &align, bool normalize_weights=true, bool remove_center=true)
	set weights and remove the center from reference with normalized weights. If the com has been removed, it resets to the new value More...

void	setDisplace (const std::vector< double > &displace, bool normalize_weights=true)
	set align More...

std::string	getMethod ()

double	simpleAlignment (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &derivatives, std::vector< Vector > &displacement, bool squared=false) const
	workhorses More...

template<bool safe, bool alEqDis>
double	optimalAlignment (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &DDistDPos, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_DDistDRef (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_SOMA (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_DDistDRef_Rot_DRotDPos (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_DDistDRef_Rot_DRotDPos_DRotDRef (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, Matrix< std::vector< Vector > > &DRotDRef, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_PCA (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, std::vector< Vector > &alignedpositions, std::vector< Vector > &centeredpositions, std::vector< Vector > &centeredreference, Tensor &Rotation, std::vector< Vector > &DDistDPos, Matrix< std::vector< Vector > > &DRotDPos, bool squared=false) const

template<bool safe, bool alEqDis>
double	optimalAlignment_Fit (const std::vector< double > &align, const std::vector< double > &displace, const std::vector< Vector > &positions, const std::vector< Vector > &reference, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, std::vector< Vector > &centeredpositions, Vector &center_positions, bool squared=false)

double	calculate (const std::vector< Vector > &positions, std::vector< Vector > &derivatives, bool squared=false) const
	Compute rmsd: note that this is an intermediate layer which is kept in order to evtl expand with more alignment types/user options to be called while keeping the workhorses separated. More...

double	calc_DDistDRef (const std::vector< Vector > &positions, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, const bool squared=false)
	Other convenience methods: calculate the derivative of distance respect to position(DDistDPos) and reference (DDistDPos) More...

double	calc_SOMA (const std::vector< Vector > &positions, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, const bool squared=false)
	calculate the derivative for SOMA (i.e. derivative respect to reference frame without the matrix derivative) More...

double	calc_DDistDRef_Rot_DRotDPos (const std::vector< Vector > &positions, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, const bool squared=false)

double	calc_DDistDRef_Rot_DRotDPos_DRotDRef (const std::vector< Vector > &positions, std::vector< Vector > &DDistDPos, std::vector< Vector > &DDistDRef, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, Matrix< std::vector< Vector > > &DRotDRef, const bool squared=false)

double	calc_PCAelements (const std::vector< Vector > &pos, std::vector< Vector > &DDistDPos, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, std::vector< Vector > &alignedpositions, std::vector< Vector > &centeredpositions, std::vector< Vector > &centeredreference, const bool &squared=false) const
	convenience method to retrieve all the bits and pieces for PCA More...

double	calc_FitElements (const std::vector< Vector > &pos, Tensor &Rotation, Matrix< std::vector< Vector > > &DRotDPos, std::vector< Vector > &centeredpositions, Vector &center_positions, const bool &squared=false)
	convenience method to retrieve all the bits and pieces needed by FitToTemplate More...

Static Public Member Functions
static Tensor	getMatrixFromDRot (Matrix< std::vector< Vector > > &drotdpos, const unsigned &i, const unsigned &a)
	static convenience method to get the matrix i,a from drotdpos (which is a bit tricky) More...

Private Types
enum	AlignmentMethod { SIMPLE, OPTIMAL, OPTIMAL_FAST }

Private Member Functions
Vector	calculateCenter (std::vector< Vector > &p, std::vector< double > &w)

void	removeCenter (std::vector< Vector > &p, Vector &c)

void	addCenter (std::vector< Vector > &p, Vector &c)

Private Attributes
AlignmentMethod	alignmentMethod

std::vector< Vector >	reference

std::vector< double >	align

std::vector< double >	displace

Vector	reference_center

bool	reference_center_is_calculated

bool	reference_center_is_removed

Vector	positions_center

bool	positions_center_is_calculated

bool	positions_center_is_removed

Detailed Description

A class that implements RMSD calculations This is a class that implements the various infrastructure to calculate the RMSD or MSD respect a given frame.

It can be done through an optimal alignment scheme as Kearsley or, more simply, by resetting the center of mass. This is the class that decides this. A very simple use is

#include "tools/PDB.h"
#include "tools/RMSD.h"
#include "tools/Vector.h"
using namespace PLMD;
RMSD rmsd;
PDB pdb;
// get the pdb (see PDB documentation)
pdb.read("file.pdb",true,1.0);
string type;
type.assign("OPTIMAL");
// set the reference and the type 
rmsd.set(pdb,type);
// this calculates the rmsd and the derivatives
vector<Vector> derivs;
double val; 
val=rmsd.calculate(getPositions(),derivs,true);

Member Enumeration Documentation

enum PLMD::RMSD::AlignmentMethod

private

Enumerator
SIMPLE
OPTIMAL
OPTIMAL_FAST

Constructor & Destructor Documentation

PLMD::RMSD::RMSD ( )

Constructor.

Member Function Documentation

void PLMD::RMSD::addCenter	(	std::vector< Vector > &	p,
		Vector &	c
	)

inlineprivate

double PLMD::RMSD::calc_DDistDRef	(	const std::vector< Vector > &	positions,
		std::vector< Vector > &	DDistDPos,
		std::vector< Vector > &	DDistDRef,
		const bool	squared = `false`
	)

Other convenience methods: calculate the derivative of distance respect to position(DDistDPos) and reference (DDistDPos)

convenience method for calculating the standard derivatives and the derivative of the rmsd respect to the reference position

double PLMD::RMSD::calc_DDistDRef_Rot_DRotDPos	(	const std::vector< Vector > &	positions,
		std::vector< Vector > &	DDistDPos,
		std::vector< Vector > &	DDistDRef,
		Tensor &	Rotation,
		Matrix< std::vector< Vector > > &	DRotDPos,
		const bool	squared = `false`
	)

double PLMD::RMSD::calc_DDistDRef_Rot_DRotDPos_DRotDRef	(	const std::vector< Vector > &	positions,
		std::vector< Vector > &	DDistDPos,
		std::vector< Vector > &	DDistDRef,
		Tensor &	Rotation,
		Matrix< std::vector< Vector > > &	DRotDPos,
		Matrix< std::vector< Vector > > &	DRotDRef,
		const bool	squared = `false`
	)

double PLMD::RMSD::calc_FitElements	(	const std::vector< Vector > &	pos,
		Tensor &	Rotation,
		Matrix< std::vector< Vector > > &	DRotDPos,
		std::vector< Vector > &	centeredpositions,
		Vector &	center_positions,
		const bool &	squared = `false`
	)

convenience method to retrieve all the bits and pieces needed by FitToTemplate

double PLMD::RMSD::calc_PCAelements	(	const std::vector< Vector > &	pos,
		std::vector< Vector > &	DDistDPos,
		Tensor &	Rotation,
		Matrix< std::vector< Vector > > &	DRotDPos,
		std::vector< Vector > &	alignedpositions,
		std::vector< Vector > &	centeredpositions,
		std::vector< Vector > &	centeredreference,
		const bool &	squared = `false`
	)		const

convenience method to retrieve all the bits and pieces for PCA

double PLMD::RMSD::calc_SOMA	(	const std::vector< Vector > &	positions,
		std::vector< Vector > &	DDistDPos,
		std::vector< Vector > &	DDistDRef,
		const bool	squared = `false`
	)

calculate the derivative for SOMA (i.e. derivative respect to reference frame without the matrix derivative)

convenience method for calculating the standard derivatives and the derivative of the rmsd respect to the reference position without the matrix contribution as required by SOMA

double PLMD::RMSD::calculate	(	const std::vector< Vector > &	positions,
		std::vector< Vector > &	derivatives,
		bool	squared = `false`
	)		const

Compute rmsd: note that this is an intermediate layer which is kept in order to evtl expand with more alignment types/user options to be called while keeping the workhorses separated.

This is the main workhorse for rmsd that decides to use specific optimal alignment versions.

Vector PLMD::RMSD::calculateCenter	(	std::vector< Vector > &	p,
		std::vector< double > &	w
	)

inlineprivate

void PLMD::RMSD::clear ( )

clear the structure

static Tensor PLMD::RMSD::getMatrixFromDRot	(	Matrix< std::vector< Vector > > &	drotdpos,
		const unsigned &	i,
		const unsigned &	a
	)

inlinestatic

static convenience method to get the matrix i,a from drotdpos (which is a bit tricky)

string PLMD::RMSD::getMethod ( )