Create an iterator which computes the multiplicative inverse of each iterated value.
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> Create an [iterator][mdn-iterator-protocol] which iteratively computes the [multiplicative inverse][@stdlib/math/base/special/inv].
``bash`
npm install @stdlib/math-iter-special-inv
`javascript`
var iterInv = require( '@stdlib/math-iter-special-inv' );
#### iterInv( iterator )
Returns an [iterator][mdn-iterator-protocol] which iteratively computes the [multiplicative inverse][@stdlib/math/base/special/inv] (also known as the reciprocal).
`javascript
var array2iterator = require( '@stdlib/array-to-iterator' );
var it = iterInv( array2iterator( [ -1, 2, -3 ] ) );
// returns
var r = it.next().value;
// returns -1
r = it.next().value;
// returns 0.5
r = it.next().value;
// returns ~-0.33333
// ...
`
The returned [iterator][mdn-iterator-protocol] protocol-compliant object has the following properties:
- next: function which returns an [iterator][mdn-iterator-protocol] 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][mdn-iterator-protocol] and returns a single (optional) argument in an [iterator][mdn-iterator-protocol] protocol-compliant object.
- If an iterated value is non-numeric (including NaN), the returned [iterator][mdn-iterator-protocol] returns NaN. If non-numeric iterated values are possible, you are advised to provide an [iterator][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly.Symbol.iterator
- If an environment supports and a provided [iterator][mdn-iterator-protocol] is iterable, the returned [iterator][mdn-iterator-protocol] is iterable.
`javascript
var randu = require( '@stdlib/random-iter-randu' );
var iterInv = require( '@stdlib/math-iter-special-inv' );
// Create a seeded iterator for generating pseudorandom numbers:
var rand = randu({
'seed': 1234,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterator:
var it = iterInv( rand );
// Perform manual iteration...
var r;
while ( true ) {
r = it.next();
if ( r.done ) {
break;
}
console.log( r.value );
}
`
*
- [@stdlib/math-base/special/inv][@stdlib/math/base/special/inv]: compute the multiplicative inverse of a double-precision floating-point number.
- [@stdlib/math-iter/special/pow][@stdlib/math/iter/special/pow]: create an iterator which evaluates the exponential function.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
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[@stdlib/math/base/special/inv]: https://www.npmjs.com/package/@stdlib/math-base-special-inv
[@stdlib/math/iter/special/pow]: https://www.npmjs.com/package/@stdlib/math-iter-special-pow