TransformationModelInterpolated Class Reference

Interpolation model for transformations. More...

#include <OpenMS/ANALYSIS/MAPMATCHING/TransformationModelInterpolated.h>

Inheritance diagram for TransformationModelInterpolated:

Classes
class	Interpolator
	The class defines a generic interpolation technique used in the TransformationModelInterpolated. More...

Public Member Functions
	TransformationModelInterpolated (const DataPoints &data, const Param &params)
	Constructor. More...
	~TransformationModelInterpolated ()
	Destructor. More...
double	evaluate (double value) const
	Evaluate the interpolation model at the given value. More...
Public Member Functions inherited from TransformationModel
	TransformationModel ()
	Constructor. More...
	TransformationModel (const TransformationModel::DataPoints &, const Param &)
virtual	~TransformationModel ()
	Destructor. More...
const Param &	getParameters () const
	Gets the (actual) parameters. More...

Static Public Member Functions
static void	getDefaultParameters (Param &params)
	Gets the default parameters. More...
Static Public Member Functions inherited from TransformationModel
static void	getDefaultParameters (Param &params)
	Gets the default parameters. More...

Private Member Functions
void	preprocessDataPoints_ (const DataPoints &data)
	Preprocesses the incoming data and fills the (private) vectors x_ and y_. More...

Private Attributes
std::vector< double >	x_
	Data coordinates x. More...
std::vector< double >	y_
	Data coordinates y. More...
Interpolator *	interp_
	Interpolation function. More...
TransformationModelLinear *	lm_front_
	Linear model for extrapolation (front) More...
TransformationModelLinear *	lm_back_
	Linear model for extrapolation (back) More...

Additional Inherited Members
Public Types inherited from TransformationModel
typedef std::pair< double, double >	DataPoint
	Coordinate pair. More...
typedef std::vector< DataPoint >	DataPoints
	Vector of coordinate pairs. More...
Protected Attributes inherited from TransformationModel
Param	params_
	Parameters. More...

Detailed Description

Interpolation model for transformations.

Between the data points, the interpolation uses the neighboring points to interpolate. The following interpolation methods are available:

• linear: Linearly interpolate between neighboring points
• cspline: Use a cubic spline to interpolate between neighboring points
• akima: Use an akima spline to interpolate between neighboring points (less affected by outliers)

Outside the range spanned by the points, we extrapolate using one of the following methods:

• two-point-linear: Uses a line through the first and last point to extrapolate
• four-point-linear: Uses a line through the first and second point to extrapolate in front and and a line through the last and second-to-last point in the end. If the data is non-linear, this may yield better approximations for extrapolation.
• global-linear: Uses a linear regression to fit a line through all data points and use it for extrapolation. Note that global-linear extrapolation may not be continuous with the interpolation at the border.

Constructor & Destructor Documentation

TransformationModelInterpolated()

TransformationModelInterpolated	(	const DataPoints &	data,
		const Param &	params
	)

Constructor.

Parameters

data	The known data points.
params	Param object holding information on which model to choose.

Exceptions

IllegalArgument

is thrown if there are not enough data points or if an unknown interpolation type is given.

~TransformationModelInterpolated()

~TransformationModelInterpolated

(

)

Destructor.

Member Function Documentation

evaluate()

double evaluate ( double  value ) const

virtual

Evaluate the interpolation model at the given value.

Parameters

value

The position where the interpolation should be evaluated.

Returns

The interpolated value.

Reimplemented from TransformationModel.

getDefaultParameters()

static void getDefaultParameters ( Param &  params )

static

Gets the default parameters.

preprocessDataPoints_()

void preprocessDataPoints_ ( const DataPoints &  data )

private

Preprocesses the incoming data and fills the (private) vectors x_ and y_.

Member Data Documentation

interp_

Interpolator* interp_

private

Interpolation function.

lm_back_

TransformationModelLinear* lm_back_

private

Linear model for extrapolation (back)

lm_front_

TransformationModelLinear* lm_front_

private

Linear model for extrapolation (front)

x_

std::vector<double> x_

private

Data coordinates x.

y_

std::vector<double> y_

private

Data coordinates y.