tanh(), tanhf()

hyperbolic tangent function 

Function

SYNOPSIS

#include <math.h>

double tanh(double x)

float tanhf(float x)

DESCRIPTION

The tanh() and tanhf() functions compute the hyperbolic tangent of x.

To check for errors, set errno to 0 before calling tanh(). If errno is non-zero on return, or the return value is NaN, an error has occurred.

The tanhf() function is a single-precision version of tanh().

PARAMETERS

x 

Is the value whose hyperbolic tangent is to be computed.

RETURN VALUES

The tanh() function returns the hyperbolic tangent of x.

If x is NaN, NaN is returned and if in POSIX mode, errno is set to EDOM. If in SVID or XOPEN mode, the matherr() function is called.

If it underflows, 0.0 is returned and if in POSIX mode, errno is set to ERANGE. If in SVID or XOPEN mode, the matherr() function is called.

CONFORMANCE

tanh(): ANSI/ISO 9899-1990

tanhf(): MKS Toolkit UNIX APIs extension

MULTITHREAD SAFETY LEVEL

MT-Safe

PORTING ISSUES

None.

AVAILABILITY

MKS Toolkit for Professional Developers
MKS Toolkit for Enterprise Developers
MKS Toolkit for Enterprise Developers 64-Bit Edition

SEE ALSO

Functions:
acos(), asin(), atan(), atan2(), cos(), cosh(), math(), sin(), sinh(), tan()

MKS Toolkit 9.2 Documentation Build 16.