@stdlib/math-base-special-asec NPM

asec

$NPM version$ $Build Status$ $Coverage Status$

Compute the inverse (arc) secant of a number.

Installation

npm install @stdlib/math-base-special-asec

Usage

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

asec( x )

Computes the inverse (arc) secant of x.

var v = asec( 1.0 );
// returns 0.0

v = asec( 2.0 );
// returns ~1.0472

v = asec( NaN );
// returns NaN

The domain of x is restricted to the intervals [-inf, -1] and [1, inf]. For x outside of these intervals, the function returns NaN.

var v = asec( -0.5 );
// returns NaN

v = asec( 0.5 );
// returns NaN

Examples

var linspace = require( '@stdlib/array-base-linspace' );
var asec = require( '@stdlib/math-base-special-asec' );

var x = linspace( 1.0, 10.0, 100 );

var i;
for ( i = 0; i < x.length; i++ ) {
    console.log( asec( x[ i ] ) );
}

C APIs

Usage

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

stdlib_base_asec( x )

Computes the inverse (arc) secant of x.

double out = stdlib_base_asec( 2.0 );
// returns ~1.0472

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_asec( const double x );

Examples

#include "stdlib/math/base/special/asec.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_asec( x[ i ] );
        printf( "asec(%lf) = %lf\n", x[ i ], v );
    }
}

Notice

This package is part of 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, see the main project repository.