asinh, asinhf, asinhl

Functions

Basic operations

abslabsllabsimaxabs (C99)
fabs
divldivlldivimaxdiv (C99)
fmod

remainder (C99)
remquo (C99)
fma (C99)
fmax (C99)
fmin (C99)
fdim (C99)
nannanfnanl (C99)(C99)(C99)

Exponential functions

exp
exp2 (C99)
expm1 (C99)

log
log10
log1p (C99)
log2 (C99)

Power functions

sqrt
cbrt (C99)

hypot (C99)
pow

Trigonometric and hyperbolic functions

sin
cos
tan
asin
acos
atan
atan2

sinh
cosh
tanh
asinh (C99)
acosh (C99)
atanh (C99)

Error and gamma functions

erf (C99)
erfc (C99)

lgamma (C99)
tgamma (C99)

Nearest integer floating point operations

ceil
floor
roundlroundllround (C99)(C99)(C99)

trunc (C99)
nearbyint (C99)
rintlrintllrint (C99)(C99)(C99)

Floating point manipulation functions

ldexp
scalbnscalbln (C99)(C99)
ilogb (C99)
logb (C99)

frexp
modf
nextafternexttoward (C99)(C99)
copysign (C99)

Classification

fpclassify (C99)
isfinite (C99)
isinf (C99)
isnan (C99)
isnormal (C99)
signbit (C99)

isgreater (C99)
isgreaterequal (C99)
isless (C99)
islessequal (C99)
islessgreater (C99)
isunordered (C99)

Types

div_tldiv_tlldiv_timaxdiv_t

(C99)(C99)

float_tdouble_t

(C99)(C99)

Macro constants

HUGE_VALFHUGE_VALHUGE_VALL (C99)(C99)
FP_FAST_FMAFFP_FAST_FMAFP_FAST_FMAL (C99)(C99)(C99)
math_errhandlingMATH_ERRNOMATH_ERRNOEXCEPT (C99)(C99)(C99)

INFINITY (C99)
NAN (C99)
FP_ILOGB0FP_ILOGBNAN (C99)(C99)
FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C99)(C99)(C99)(C99)(C99)

Defined in header `<math.h>`
float asinhf( float arg );	(1)	(since C99)
double asinh( double arg );	(2)	(since C99)
long double asinhl( long double arg );	(3)	(since C99)
Defined in header `<tgmath.h>`
#define asinh( arg )	(4)	(since C99)

1-3) Computes the inverse hyperbolic sine of arg.

4) Type-generic macro: If the argument has type long double, asinhl is called. Otherwise, if the argument has integer type or the type double, asinh is called. Otherwise, asinhf is called. If the argument is complex, then the macro invokes the corresponding complex function (casinhf, casinh, casinhl).

Parameters

arg

-

floating point value representing the area of a hyperbolic sector

Return value

If no errors occur, the inverse hyperbolic sine of arg ( $sinh -1 (arg)$ , or $arsinh(arg)$ ), is returned.

If a range error occurs due to underflow, the correct result (after rounding) is returned.

Error handling

Errors are reported as specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

if the argument is 0 or , it is returned unmodified
if the argument is NaN, NaN is returned

Notes

Although the C standard names this function "arc hyperbolic sine", the inverse functions of the hyperbolic functions are the area functions. Their argument is the area of a hyperbolic sector, not an arc. The correct name is "inverse hyperbolic sine" (used by POSIX) or "area hyperbolic sine".

Example

Run this code

#include <stdio.h>
#include <math.h>

int main(void)
{
    printf("asinh(1) =%f\nasinh(-1) =%f\n", asinh(1), asinh(-1));
    // special values
    printf("asinh(+0) =%f\nasinh(-0) =%f\n", asinh(0.0), asinh(-0.0));
}

Output:

asinh(1) = 0.881374
asinh(-1) = -0.881374
asinh(+0) = 0.000000
asinh(-0) = -0.000000

References

C11 standard (ISO/IEC 9899:2011):

7.12.5.2 The asinh functions (p: 240-241)

7.25 Type-generic math <tgmath.h> (p: 373-375)

F.10.2.2 The asinh functions (p: 520)

C99 standard (ISO/IEC 9899:1999):

7.12.5.2 The asinh functions (p: 221)

7.22 Type-generic math <tgmath.h> (p: 335-337)

F.9.2.2 The asinh functions (p: 457)

External links

Weisstein, Eric W. "Inverse Hyperbolic Sine." From MathWorld--A Wolfram Web Resource.

Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Date and time utilities
Strings library
Algorithms
Numerics
Input/output support
Localization support
Atomic operations (C11)
Thread support (C11)
Technical Specifications

Common mathematical functions
Floating-point environment
Complex number arithmetics
Random number generation
Type-generic math

acoshacoshfacoshl (C99)(C99)(C99)	computes inverse hyperbolic cosine ( $arcosh(x)$ ) (function)
atanhatanhfatanhl (C99)(C99)(C99)	computes inverse hyperbolic tangent ( $artanh(x)$ ) (function)
sinhsinhfsinhl (C99)(C99)	computes hyperbolic sine ( $sh(x)$ ) (function)
casinhcasinhfcasinhl (C99)(C99)(C99)	computes the complex arc hyperbolic sine (function)