deg2rad

Convert an angle from degrees to radians.

Usage

var deg2rad = require( '@stdlib/math/base/special/deg2rad' );

deg2rad( x )

Converts an angle from degrees to radians.

var r = deg2rad( 90.0 );
// returns ~1.571

r = deg2rad( -45.0 );
// returns ~-0.785

r = deg2rad( NaN );
// returns NaN

Examples

var randu = require( '@stdlib/random/base/randu' );
var deg2rad = require( '@stdlib/math/base/special/deg2rad' );

var d;
var r;
var i;

for ( i = 0; i < 100; i++ ) {
    d = (randu()*720.0) - 360.0;
    r = deg2rad( d );
    console.log( 'degrees: %d => radians: %d', d, r );
}

C APIs

Usage

#include "stdlib/math/base/special/deg2rad.h"

stdlib_base_deg2rad( x )

Converts an angle from degrees to radians.

double y = stdlib_base_deg2rad( 90.0 );
// returns ~1.571

The function accepts the following arguments:

x: [in] double input value.

double stdlib_base_deg2rad( const double x );

Examples

#include "stdlib/math/base/special/deg2rad.h"
#include <stdio.h>

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

    double y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_deg2rad( x[ i ] );
        printf( "deg2rad(%lf) = %lf\n", x[ i ], y );
    }
}