iterAtan2

Create an iterator which iteratively computes the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).

Usage

var iterAtan2 = require( '@stdlib/math/iter/special/atan2' );

iterAtan2( y, x )

Returns an iterator which iteratively computes the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).

var array2iterator = require( '@stdlib/array/to-iterator' );

var x = array2iterator( [ 2.0, 2.0, -1.0 ] );
var y = array2iterator( [ 2.0, 6.0, -1.0 ] );

var it = iterAtan2( y, x );
// returns <Object>

var r = it.next().value;
// returns ~0.785

r = it.next().value;
// returns ~1.249

r = it.next().value;
// returns ~-2.356

// ...

The returned iterator protocol-compliant object has the following properties:

• next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
• return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

If provided a numeric value as an iterator argument, the value is broadcast as an infinite iterator which always returns the provided value.

var array2iterator = require( '@stdlib/array/to-iterator' );

var y = array2iterator( [ 2.0, 6.0 ] );

var it = iterAtan2( y, 2.0 );
// returns <Object>

var v = it.next().value;
// returns ~0.785

v = it.next().value;
// returns ~1.249

var bool = it.next().done;
// returns true

Notes

• If an iterated value is non-numeric (including NaN), the returned iterator returns NaN. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
• The length of the returned iterator is equal to the length of the shortest provided iterator. In other words, the returned iterator ends once one of the provided iterators ends.
• If an environment supports Symbol.iterator and a provided iterator is iterable, the returned iterator is iterable.

Examples

var uniform = require( '@stdlib/random/iter/uniform' );
var iterAtan2 = require( '@stdlib/math/iter/special/atan2' );

// Create seeded iterators for generating pseudorandom numbers:
var x = uniform( -2.0, 2.0, {
    'seed': 1234,
    'iter': 10
});

var y = uniform( -2.0, 2.0, {
    'seed': 4567,
    'iter': 10
});

// Create an iterator which consumes the pseudorandom number iterators:
var it = iterAtan2( y, x );

// Perform manual iteration...
var r;
while ( true ) {
    r = it.next();
    if ( r.done ) {
        break;
    }
    console.log( r.value );
}

---

See Also

• @stdlib/math/base/special/atan2: compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
• @stdlib/math/iter/special/atan: create an iterator which computes the arctangent of each iterated value.