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).

Installation

npm install @stdlib/math-iter-special-atan2

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.

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.