Convert an angle from degrees to radians.

## Usage

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

Converts an angle from degrees to radians.

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

// returns ~-0.785

// returns NaN
``````

## Examples

``````var randu = require( '@stdlib/random/base/randu' );

var d;
var r;
var i;

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

## C APIs

### Usage

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

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() {
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 );
}
}
``````