README.md

asind

Compute the arcsine in degrees of a double-precision floating-point number.

Usage

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

asind( x )

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

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

v = asind( 0.5 );
// returns ~30.0

v = asind( sqrt( 2.0 ) / 2.0 );
// returns ~45.0

v = asind( sqrt( 3.0 ) / 2.0 );
// returns ~60.0

v = asind( NaN );
// returns NaN

The domain of x is restricted to [-1,1]. If |x| > 1, the function returns NaN.

var v = asind( -3.14 );
// returns NaN

Examples

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

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

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

---

C APIs

Usage

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

stdlib_base_asind( x )

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

double out = stdlib_base_asind( 0.0 );
// returns 0.0

out = stdlib_base_asind( 0.5 );
// returns ~30.0

The function accepts the following arguments:

• x: [in] double input value.

double stdlib_base_asind( const double x );

Examples

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