Compute the hyperbolic cosine of a double-precision floating-point number.
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> Compute the [hyperbolic cosine][hyperbolic-cosine] of a double-precision floating-point number.
``bash`
npm install @stdlib/math-base-special-cosh
`javascript`
var cosh = require( '@stdlib/math-base-special-cosh' );
#### cosh( x )
Computes the [hyperbolic cosine][hyperbolic-cosine] of a double-precision floating-point number x.
`javascript
var v = cosh( 0.0 );
// returns 1.0
v = cosh( 2.0 );
// returns ~3.762
v = cosh( -2.0 );
// returns ~3.762
v = cosh( 710.0 );
// returns Infinity
v = cosh( NaN );
// returns NaN
`
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var cosh = require( '@stdlib/math-base-special-cosh' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -5.0, 5.0, opts );
logEachMap( 'cosh(%0.4f) = %0.4f', x, cosh );
`
*
`c`
#include "stdlib/math/base/special/cosh.h"
#### stdlib_base_cosh( x )
Computes the [hyperbolic cosine][hyperbolic-cosine] of a double-precision floating-point number.
`c
double out = stdlib_base_cosh( 2.0 );
// returns ~3.762
out = stdlib_base_cosh( -2.0 );
// returns ~3.762
`
The function accepts the following arguments:
- x: [in] double input value.
`c`
double stdlib_base_cosh( const double x );
`c
#include "stdlib/math/base/special/cosh.h"
#include
int main( void ) {
const double x[] = { -5.0, -3.89, -2.78, -1.67, -0.56, 0.56, 1.67, 2.78, 3.89, 5.0 };
double v;
int i;
for ( i = 0; i < 10; i++ ) {
v = stdlib_base_cosh( x[ i ] );
printf( "cosh(%lf) = %lf\n", x[ i ], v );
}
}
`
*
- [@stdlib/math-base/special/cos][@stdlib/math/base/special/cos]: compute the cosine of a number.
- [@stdlib/math-base/special/sinh][@stdlib/math/base/special/sinh]: compute the hyperbolic sine of a double-precision floating-point number.
- [@stdlib/math-base/special/tanh][@stdlib/math/base/special/tanh]: compute the hyperbolic tangent of a double-precision floating-point number.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
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[deno-url]: https://github.com/stdlib-js/math-base-special-cosh/tree/deno
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[hyperbolic-cosine]: http://mathworld.wolfram.com/HyperbolicCosine.html
[@stdlib/math/base/special/cos]: https://www.npmjs.com/package/@stdlib/math-base-special-cos
[@stdlib/math/base/special/sinh]: https://www.npmjs.com/package/@stdlib/math-base-special-sinh
[@stdlib/math/base/special/tanh]: https://www.npmjs.com/package/@stdlib/math-base-special-tanh