asecd

Compute the arcsecant (in degrees) of a double-precision floating-point number.

Usage

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

asecd( x )

Computes the arcsecant (in degrees) of a double-precision floating-point number.

var sqrt = require( '@stdlib/math/base/special/sqrt' );
var v = asecd( 1 );
// returns 0.0

v = asecd( 2 * sqrt( 3 ) / 3 );
// returns ~30.0

v = asecd( sqrt( 2 ) );
// returns ~45.0

v = asecd( 2 );
// returns ~60.0

v = asecd( Infinity );
// returns 90.0

v = asecd( NaN );
// returns NaN

Examples

var uniform = require( '@stdlib/random/array/uniform' );
var logEachMap = require( '@stdlib/console/log-each-map' );
var asecd = require( '@stdlib/math/base/special/asecd' );

var x = uniform( 100, -10.0, 10.0, {
    'dtype': 'float64'
});

logEachMap( 'asecd(%0.4f) = %0.4f', x, asecd );

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C APIs

Usage

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

stdlib_base_asecd( x )

Computes the arcsecant (in degrees) of a double-precision floating-point number.

double out = stdlib_base_asecd( 1.0 );
// returns 0.0

out = stdlib_base_asecd( 2.0 );
// returns ~60.0

The function accepts the following arguments:

• x: [in] double input value.

double stdlib_base_asecd( const double x );

Examples

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

int main( void ) {
    const double x[] = { 1.0, 1.45, 1.89, 2.33, 2.78, 3.22, 3.66, 4.11, 4.55, 5.0 };

    double v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_asecd( x[ i ] );
        printf( "asecd(%lf) = %lf\n", x[ i ], v );
    }
}

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See Also

• @stdlib/math/base/special/asec: compute the inverse (arc) secant of a number.
• @stdlib/math/base/special/asech: compute the hyperbolic arcsecant of a number.
• @stdlib/math/base/special/acosd: compute the arccosine (in degrees) of a double-precision floating-point number.
• @stdlib/math/base/special/secd: compute the secant of an angle measured in degrees.