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

var x = uniform( 100, -1.0, 1.0, {
    'dtype': 'float64'
});

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

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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, 0.45, -0.89, 0.33, -0.78, -0.22, 0.66, 0.11, -0.55, 0.0 };

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

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See Also

• @stdlib/math/base/special/asin: compute the arcsine of a double-precision floating-point number.
• @stdlib/math/base/special/asinh: compute the hyperbolic arcsine of a double-precision floating-point number.
• @stdlib/math/base/special/atand: compute the arctangent(in degrees) of a double-precision floating-point number.