функция гиперболического тангенса (hyperbolic tangent function)
Имя (Name)
tanh, tanhf, tanhl - hyperbolic tangent function
Синопсис (Synopsis)
#include <math.h>
double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
tanhf(), tanhl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Описание (Description)
These functions return the hyperbolic tangent of x, which is
defined mathematically as:
tanh(x) = sinh(x) / cosh(x)
Возвращаемое значение (Return value)
On success, these functions return the hyperbolic tangent of x.
If x is a NaN, a NaN is returned.
If x is +0 (-0), +0 (-0) is returned.
If x is positive infinity (negative infinity), +1 (-1) is
returned.
Ошибки (Error)
No errors occur.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│tanh(), tanhf(), tanhl() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
Смотри также (See also)
acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
