doublen.c File Reference

Internal types used in particular for computing the average and centroid temporal aggregates. More...

#include "temporal/doublen.h"
#include <assert.h>
#include <postgres.h>
#include <meos.h>
#include "temporal/postgres_types.h"

Functions
double2 *	double2_add (const double2 *d1, const double2 *d2)
	Return the addition of the double2 values. More...
bool	double2_eq (const double2 *d1, const double2 *d2)
	Return true if the double2 values are equal. More...
double2 *	double2_make (double a, double b)
	Create a double2 value from the double values. More...
char *	double2_out (const double2 *d, int maxdd)
	Output function for double2 values. More...
void	double2_set (double a, double b, double2 *result)
	Set a double2 value from the double values. More...
double3 *	double3_add (const double3 *d1, const double3 *d2)
	Return the addition of the double3 values. More...
bool	double3_eq (const double3 *d1, const double3 *d2)
	Return true if the double3 values are equal. More...
double3 *	double3_make (double a, double b, double c)
	Create a double3 value from the double values. More...
char *	double3_out (const double3 *d, int maxdd)
	Output function for double3 values. More...
void	double3_set (double a, double b, double c, double3 *result)
	Set a double3 value from the double values. More...
double4 *	double4_add (const double4 *d1, const double4 *d2)
	Return the addition of the double4 values. More...
bool	double4_eq (const double4 *d1, const double4 *d2)
	Return true if the double4 values are equal. More...
double4 *	double4_make (double a, double b, double c, double d)
	Create a double2 value from the double values. More...
char *	double4_out (const double4 *d, int maxdd)
	Output function for double4 values. More...
void	double4_set (double a, double b, double c, double d, double4 *result)
	Set a double4 value from the double values. More...

Detailed Description

Internal types used in particular for computing the average and centroid temporal aggregates.

The double2, double3, and double4 types are base types composed, respectively, of two, three, and four double values. The tdouble2, tdouble3, and tdouble4 types are the corresponding temporal types. The in/out functions of all these types are stubs since all access should be internal. These types are used for the transition function of the aggregates, where the first components of the doubleN values store the sum and the last one stores the count of the values. The final function computes the average from the doubleN values.