README.md

cosh

Compute the hyperbolic cosine of a double-precision floating-point number.

Usage

var cosh = require( '@stdlib/math/base/special/cosh' );

cosh( x )

Computes the hyperbolic cosine of a double-precision floating-point number x.

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

Examples

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 );

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C APIs

Usage

#include "stdlib/math/base/special/cosh.h"

stdlib_base_cosh( x )

Computes the hyperbolic cosine of a double-precision floating-point number.

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.

double stdlib_base_cosh( const double x );

Examples

#include "stdlib/math/base/special/cosh.h"
#include <stdio.h>

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 );
    }
}

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See Also

• @stdlib/math/base/special/cos: compute the cosine of a number.
• @stdlib/math/base/special/sinh: compute the hyperbolic sine of a double-precision floating-point number.
• @stdlib/math/base/special/tanh: compute the hyperbolic tangent of a double-precision floating-point number.