acosdf

Compute the arccosine (in degrees) of a single-precision floating-point number.

Usage

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

acosdf( x )

Computes the arccosine (in degrees) of a single-precision floating-point number.

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

var v = acosdf( 0.0 );
// returns 90.0

v = acosdf( 0.5 );
// returns ~60.0

v = acosdf( sqrtf( 2 ) / 2 );
// returns ~45.0

v = acosdf( sqrtf( 3 ) / 2 );
// returns ~30.0

v = acosdf( NaN );
// returns NaN

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

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

Examples

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

var x = uniform( 100, -1.0, 1.0, {
    'dtype': 'float32'
});

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

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C APIs

Usage

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

stdlib_base_acosdf( x )

Computes the arccosine (in degrees) of a single-precision floating-point number.

float out = stdlib_base_acosdf( 0.0f );
// returns 90.0f

out = stdlib_base_acosdf( 0.5f );
// returns ~60.0f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_acosdf( const float x );

Examples

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

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

    float v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_acosdf( x[ i ] );
        printf( "acosdf(%f) = %f\n", x[ i ], v );
    }
}