DISSIM.c File Reference

The implementation of Trajectory. More...

#include "../../../h/SpatioTemporal/Trajectory/Similarity.h"
#include "../../../h/SpatioTemporal/Trajectory/Interpolation.h"
#include "../../../h/SpatioTemporal/Trajectory/SessionParameters.h"
#include "../../../h/Spatial/PointSP/Distance.h"
#include "../../../h/Utilities/Utilities.h"
#include <funcapi.h>
#include <access/htup_details.h>
#include <math.h>

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Functions
float8	calc_integral (float8 a, float8 b, float8 c, float8 t)
float8	compute_segment_dissim (const PointST *a1, const PointST *a2, const PointST *b1, const PointST *b2, float8 *error)
float8 *	DISSIM (const Trajectory *trajectoryA, const Trajectory *trajectoryB, int32 precision, float8 *result, float8 *error)
	The function returns DSSIM. More...
PGDLLEXPORT Datum	DISSIMExact (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (DISSIMExact)
PGDLLEXPORT Datum	DISSIMApproximate (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (DISSIMApproximate)

Detailed Description

The implementation of Trajectory.

Author

Marios Vodas (mvoda.nosp@m.s@gm.nosp@m.ail.c.nosp@m.om).

These functions are documented in the Trajectory/Similarity.h

Function Documentation

float8 calc_integral	(	float8	a,
		float8	b,
		float8	c,
		float8	t
	)

Referenced by compute_segment_dissim().

float8 compute_segment_dissim	(	const PointST *	a1,
		const PointST *	a2,
		const PointST *	b1,
		const PointST *	b2,
		float8 *	error
	)

References calc_integral(), d, differenceInSeconds(), distancePointSP_PointSP(), PointST::sp, PointST::t, timestamp2seconds(), PointSP::x, and PointSP::y.

Referenced by DISSIM().

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float8* DISSIM	(	const Trajectory *	trajectoryA,
		const Trajectory *	trajectoryB,
		int32	precision,
		float8 *	result,
		float8 *	error
	)

The function returns DSSIM.

Parameters

[in]	trajectoryA	The first trajectory
[in]	trajectoryB	The second trajectory
[in]	precision	The wanted precision
[out]	result	The result
[out]	error	The error

References atInstantTrajectory(), compute_segment_dissim(), Trajectory::NrPoints, Trajectory::points, and PointST::t.

Referenced by DISSIMApproximate(), and DISSIMExact().

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PGDLLEXPORT Datum DISSIMApproximate

(

PG_FUNCTION_ARGS

)

References DISSIM(), and validateInterpolationPrecision().

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PGDLLEXPORT Datum DISSIMExact

(

PG_FUNCTION_ARGS

)

References DISSIM(), and validateInterpolationPrecision().

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PG_FUNCTION_INFO_V1

(

DISSIMExact

)

PG_FUNCTION_INFO_V1

(

DISSIMApproximate

)