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* @license Apache-2.0
*
* Copyright (c) 2020 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var iterMap2 = require( '@stdlib/math/iter/tools/map2' );
var atan2 = require( '@stdlib/math/base/special/atan2' );
// MAIN //
/**
* 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)`.
*
* ## Notes
*
* - If provided a numeric value as an iterator argument, the value is broadcast as an **infinite** iterator which **always** returns the provided value.
* - 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 all provided iterators are iterable, the returned iterator is iterable.
*
* @param {(Iterator|number)} y - input iterator
* @param {(Iterator|number)} x - input iterator
* @throws {TypeError} first argument must be either an iterator protocol-compliant object or a number
* @throws {TypeError} second argument must be either an iterator protocol-compliant object or a number
* @returns {Iterator} iterator
*
* @example
* var uniform = require( '@stdlib/random/iter/uniform' );
*
* var x = uniform( -2.0, 2.0 );
* var y = uniform( -2.0, 2.0 );
*
* var iter = iterAtan2( y, x );
*
* var r = iter.next().value;
* // returns <number>
*
* r = iter.next().value;
* // returns <number>
*
* r = iter.next().value;
* // returns <number>
*
* // ...
*/
function iterAtan2( y, x ) {
return iterMap2( y, x, atan2 );
}
// EXPORTS //
module.exports = iterAtan2;
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