WCSLIB: wcsmath.h File Reference

WCSLIB 8.2.2

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C

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Macros
#define	PI 3.141592653589793238462643

#define	D2R PI/180.0
	Degrees to radians conversion factor.

#define	R2D 180.0/PI
	Radians to degrees conversion factor.

#define	SQRT2 1.4142135623730950488

#define	SQRT2INV 1.0/SQRT2

#define	UNDEFINED 987654321.0e99
	Value used to indicate an undefined quantity.

#define	undefined(value) (value == UNDEFINED)
	Macro used to test for an undefined quantity.

Detailed Description

Definition of mathematical constants used by WCSLIB.

Macro Definition Documentation

◆ PI

#define PI 3.141592653589793238462643

◆ D2R

#define D2R PI/180.0

Degrees to radians conversion factor.

Factor $\pi/180^\circ$ to convert from degrees to radians.

◆ R2D

#define R2D 180.0/PI

Radians to degrees conversion factor.

Factor $180^\circ/\pi$ to convert from radians to degrees.

◆ SQRT2

#define SQRT2 1.4142135623730950488

$\sqrt{2}$ , used only by molset() (MOL projection).

◆ SQRT2INV

#define SQRT2INV 1.0/SQRT2

$1/\sqrt{2}$ , used only by qscx2s() (QSC projection).

◆ UNDEFINED

#define UNDEFINED 987654321.0e99

Value used to indicate an undefined quantity.

Value used to indicate an undefined quantity (noting that NaNs cannot be used portably).

◆ undefined

#define undefined ( value ) (value == UNDEFINED)

Macro used to test for an undefined quantity.

Macro used to test for an undefined value.