iterMultiply
Create an iterator which performs element-wise multiplication of two or more iterators.
Usage
var iterMultiply = require( '@stdlib/math/iter/ops/multiply' );
iterMultiply( iter0, ...iterator )
Returns an iterator which performs element-wise multiplication of two or more iterators.
var array2iterator = require( '@stdlib/array/to-iterator' );
var it1 = array2iterator( [ 1.0, 2.0 ] );
var it2 = array2iterator( [ 3.0, 4.0 ] );
var it = iterMultiply( it1, it2 );
// returns <Object>
var v = it.next().value;
// returns 3.0
v = it.next().value;
// returns 8.0
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
valueproperty and adoneproperty having abooleanvalue 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 arr = array2iterator( [ 1.0, 2.0 ] );
var it = iterMultiply( arr, 5.0 );
// returns <Object>
var v = it.next().value;
// returns 5.0
v = it.next().value;
// returns 10.0
var bool = it.next().done;
// returns true
Notes
- 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 aniteratorwhich 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.iteratorand provided iterators are iterable, the returned iterator is iterable.
Examples
var iterSineWave = require( '@stdlib/simulate/iter/sine-wave' );
var iterMultiply = require( '@stdlib/math/iter/ops/multiply' );
// 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 multiplies the two waveforms:
var it = iterMultiply( sine1, sine2 );
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}