math.c File Reference

Macros
#define	MAXPOWTWO   4.503599627370496000E+15
	Max power for forward and reverse projections.

Functions
double	round (double x)
	Returns the integral value that is nearest to x, with halfway cases rounded away from zero. More...
double	floor (double x)
	Rounds x downward, returning the largest integral value that is not greater than x. More...
double	ceil (double x)
	Rounds x upward, returning the smallest integral value that is not less than x. More...
double	pow (double base, double exponent)
	Returns base raised to the power exponent: More...
double	exp (double x)
	Returns the base-e exponential function of x, which is e raised to the power x: e^x. More...
double	fabs (double x)
	Returns the absolute value of x: |x|. More...
float	fabsf (float x)
	Returns the absolute value of x: |x|. More...
double	sqrt (double x)
	Returns the square root of x. More...
float	sqrtf (float x)
	Returns the square root of x. More...
int	isinf (double x)
	Checks if the input value is Infinite (INF). More...
int	isnan (double x)
	Checks if the input value is Not A Number (NAN). More...
double	log10 (double x)
	Logarithm function in base 10. More...
double	ln (double x)
	Natural logarithm function. More...
double	logx (double x, double y)
	Logarithm function in base x. More...
double	modf (double x, double *intpart)
	Breaks x into an integral and a fractional part, both parts have the same sign as x. More...

Detailed Description

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

ceil()

double ceil

(

double

x

)

Rounds x upward, returning the smallest integral value that is not less than x.

Parameters

x	Value to round up.

Returns

The smallest integral value that is not less than x (as a floating-point value).

exp()

double exp

(

double

x

)

Returns the base-e exponential function of x, which is e raised to the power x: e^x.

Parameters

x	Value of the exponent.

Returns

Exponential value of x.

If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs and the global variable errno is set to ERANGE.

fabs()

double fabs

(

double

x

)

Returns the absolute value of x: |x|.

Parameters

x	Value whose absolute value is returned.

Returns

The absolute value of x.

fabsf()

float fabsf

(

float

x

)

Returns the absolute value of x: |x|.

Parameters

x	Value whose absolute value is returned.

Returns

The absolute value of x.

floor()

double floor

(

double

x

)

Rounds x downward, returning the largest integral value that is not greater than x.

Parameters

x	Value to round down.

Returns

The value of x rounded downward (as a floating-point value).

isinf()

int isinf

(

double

x

)

Checks if the input value is Infinite (INF).

Parameters

x	The value to check.

Returns

1 if INF, 0 otherwise.

isnan()

int isnan

(

double

x

)

Checks if the input value is Not A Number (NAN).

Parameters

x	The value to check.

Returns

1 if NAN, 0 otherwise.

ln()

double ln

(

double

x

)

Natural logarithm function.

Parameters

x	Topic of the logarithm function.

Returns

Return the result.

log10()

double log10

(

double

x

)

Logarithm function in base 10.

Parameters

x	Topic of the logarithm function.

Returns

Return the result.

logx()

double logx	(	double	x,
		double	y
	)

Logarithm function in base x.

Parameters

x	Base of the logarithm.
y	Topic of the logarithm function.

Returns

Return the result.

modf()

double modf	(	double	x,
		double *	intpart
	)

Breaks x into an integral and a fractional part, both parts have the same sign as x.

Parameters

x	The value we want to break.
intpart	Where we store the integer part.

Returns

the fractional part.

pow()

double pow	(	double	base,
		double	exponent
	)

Returns base raised to the power exponent:

Parameters

base	Base value.
exponent	Exponent value.

Returns

The result of raising base to the power exponent.

If the base is finite negative and the exponent is finite but not an integer value, it causes a domain error. If both base and exponent are zero, it may also cause a domain error on certain implementations. If base is zero and exponent is negative, it may cause a domain error or a pole error (or none, depending on the library implementation). The function may also cause a range error if the result is too great or too small to be represented by a value of the return type.

round()

double round

(

double

x

)

Returns the integral value that is nearest to x, with halfway cases rounded away from zero.

Parameters

x	Value to round.

Returns

The value of x rounded to the nearest integral (as a floating-point value).

sqrt()

double sqrt

(

double

x

)

Returns the square root of x.

Parameters

x	Value whose square root is computed.

Returns

Square root of x. If x is negative, the global variable errno is set to EDOM.

sqrtf()

float sqrtf

(

float

x

)

Returns the square root of x.

Parameters

x	Value whose square root is computed.

Returns

Square root of x. If x is negative, the global variable errno is set to EDOM.