cosd

Computes the cosine of an angle measured in degrees.

Usage

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

cosd( x )

Computes the cosine of x (in degrees).

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

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

v = cosd( 90.0 );
// returns 0.0

v = cosd( NaN );
// returns NaN

Examples

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

var x = linspace( -180, 180, 100 );

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

C APIs

Usage

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

stdlib_base_cosd( x )

Computes the cosine of x (in degrees).

double out = stdlib_base_cosd( 0.0 );
// returns 1.0

out = stdlib_base_cosd( 60.0 );
// returns ~0.5

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_cosd( const double x );

Examples

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

int main( void ) {
    const double x[] = { 0.0, 30.0, 45.0, 60.0, 90.0 };

    double y;
    int i;
    for ( i = 0; i < 5; i++ ) {
        y = stdlib_base_cosd( x[ i ] );
        printf( "cosd(%lf) = %lf\n", x[ i ], y );
    }
}