# polar
> Compute the [absolute value][@stdlib/math/base/special/cabs] and [phase][@stdlib/math/base/special/cphase] of a complex number.
## Usage
```javascript
var cpolar = require( '@stdlib/math/base/special/cpolar' );
```
#### cpolar( \[out,] re, im )
Computes the [absolute value][@stdlib/math/base/special/cabs] and [phase][@stdlib/math/base/special/cphase] of a complex number comprised of a **real** component `re` and an **imaginary** component `im`.
```javascript
var o = cpolar( 5.0, 3.0 );
// returns [ ~5.83, ~0.5404 ]
```
By default, the function returns real and imaginary components as a two-element `array`. To avoid unnecessary memory allocation, the function supports providing an output (destination) object.
```javascript
var Float64Array = require( '@stdlib/array/float64' );
var out = new Float64Array( 2 );
var o = cpolar( out, 5.0, 3.0 );
// returns [ ~5.83, ~0.5404 ]
var bool = ( o === out );
// returns true
```
## Examples
```javascript
var Complex128 = require( '@stdlib/complex/float64' );
var randu = require( '@stdlib/random/base/randu' );
var round = require( '@stdlib/math/base/special/round' );
var real = require( '@stdlib/complex/real' );
var imag = require( '@stdlib/complex/imag' );
var cpolar = require( '@stdlib/math/base/special/cpolar' );
var re;
var im;
var z;
var o;
var i;
for ( i = 0; i < 100; i++ ) {
re = round( randu()*100.0 ) - 50.0;
im = round( randu()*100.0 ) - 50.0;
z = new Complex128( re, im );
o = cpolar( real(z), imag(z) );
z = z.toString();
console.log( 'abs(%s) = %d. arg(%s) = %d', z, o[0], z, o[1] );
}
```
[@stdlib/math/base/special/cabs]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/cabs
[@stdlib/math/base/special/cphase]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/cphase