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| tanh |
| Portability: | ISO/ANSI C conforming, UNIX compatible |
| SYNOPSIS | |
| DESCRIPTION | |
| RETURN VALUE | |
| DIAGNOSTICS | |
| EXAMPLE | |
| RELATED FUNCTIONS | |
| SEE ALSO |
| SYNOPSIS |
#include <math.h> double tanh(double x);
| DESCRIPTION |
tanh
computes the hyperbolic tangent of its argument x, as expressed by this relation:
![[IMAGE]](./images/deqn11.gif)
| RETURN VALUE |
tanh
returns the principal value of the hyperbolic tangent of the argument
x
, provided that this value is defined and computable.
The return value is a double-precision, floating-point number in the closed
interval [-1.0,1.0] .
| DIAGNOSTICS |
If an error occurs in
tanh
, the
_matherr
routine is called.
You can supply your own version of
_matherr
to suppress the diagnostic message or modify the value returned.
| EXAMPLE |
#include <math.h>
#include <stdio.h>
#define INVAL 3.8
main()
{
double hyper_tan;
hyper_tan = tanh(INVAL);
printf("tanh(%f) = %f\n", INVAL, hyper_tan);
}
| RELATED FUNCTIONS |
| SEE ALSO |
|
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