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Create an iterator which performs element-wise subtraction of two or more iterators.
import iterSubtract from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-iter-ops-subtract@esm/index.mjs';
Returns an iterator which performs element-wise subtraction of two or more iterators.
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@esm/index.mjs';
var it1 = array2iterator( [ 1.0, 5.0 ] );
var it2 = array2iterator( [ 3.0, 4.0 ] );
var it = iterSubtract( it1, it2 );
// returns <Object>
var v = it.next().value;
// returns -2.0
v = it.next().value;
// returns 1.0
var bool = it.next().done;
// returns true
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 adone
property having aboolean
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.
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@esm/index.mjs';
var arr = array2iterator( [ 1.0, 2.0 ] );
var it = iterSubtract( arr, 4.0 );
// returns <Object>
var v = it.next().value;
// returns -3.0
v = it.next().value;
// returns -2.0
var bool = it.next().done;
// returns true
- If an iterated value is non-numeric (including
NaN
), the returned iterator returnsNaN
. If non-numeric iterated values are possible, you are advised to provide aniterator
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 provided iterators are iterable, the returned iterator is iterable.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import iterSineWave from 'https://cdn.jsdelivr.net/gh/stdlib-js/simulate-iter-sine-wave@esm/index.mjs';
import iterSubtract from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-iter-ops-subtract@esm/index.mjs';
// Create an iterator which generates a sine wave:
var sine1 = iterSineWave({
'period': 50,
'offset': 0,
'iter': 100
});
// Create another iterator which generates a higher frequency sine wave:
var sine2 = iterSineWave({
'period': 10,
'offset': 0,
'iter': 100
});
// Create an iterator which subtracts the two waveforms:
var it = iterSubtract( sine1, sine2 );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}
</script>
</body>
</html>
@stdlib/math-iter/ops/add
: create an iterator which performs element-wise addition of two or more iterators.@stdlib/math-iter/ops/divide
: create an iterator which performs element-wise division of two or more iterators.@stdlib/math-iter/ops/multiply
: create an iterator which performs element-wise multiplication of two or more iterators.
This package is part of stdlib, a standard library 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.
See LICENSE.
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