README.md

acosf

Compute the arccosine of a single-precision floating-point number.

Usage

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

acosf( x )

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

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

v = acosf( 0.707 ); // ~pi/4
// returns ~0.7855

v = acosf( 0.866 ); // ~pi/6
// returns ~0.5236

v = acosf( NaN );
// returns NaN

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

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

Examples

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

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

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

---

C APIs

Usage

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

stdlib_base_acosf( x )

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

float out = stdlib_base_acosf( 1.0f );
// returns 0.0f

out = stdlib_base_acosf( 0.707f ); // ~pi/4
// returns ~0.7855f

The function accepts the following arguments:

• x: [in] float input value (in radians).

float stdlib_base_acosf( const float x );

Examples

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

int main( void ) {
    const float x[] = { -1.0f, -0.78f, -0.56f, -0.33f, -0.11f, 0.11f, 0.33f, 0.56f, 0.78f, 1.0f };

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

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See Also

• @stdlib/math/base/special/acos: compute the arccosine of a double-precision floating-point number.
• @stdlib/math/base/special/acosh: compute the hyperbolic arccosine of a double-precision floating-point number.
• @stdlib/math/base/special/asinf: compute the arcsine of a single-precision floating-point number.
• @stdlib/math/base/special/atanf: compute the arctangent of a single-precision floating-point number.