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Create an iterator which iteratively computes the base
blogarithm.
npm install @stdlib/math-iter-special-logAlternatively,
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umdbranch (see README).
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var iterLog = require( '@stdlib/math-iter-special-log' );Returns an iterator which iteratively computes the base b logarithm of x.
var array2iterator = require( '@stdlib/array-to-iterator' );
var x = array2iterator( [ 2.0, 2.0, 10.0 ] );
var y = array2iterator( [ 2.0, 6.0, 2.0 ] );
var it = iterLog( x, y );
// returns <Object>
var r = it.next().value;
// returns 1.0
r = it.next().value;
// returns ~0.3869
r = it.next().value;
// returns ~3.3219
// ...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 x = array2iterator( [ 2.0, 6.0 ] );
var it = iterLog( x, 2.0 );
// returns <Object>
var v = it.next().value;
// returns 1.0
v = it.next().value;
// returns ~2.58496
var bool = it.next().done;
// returns true- For negative
borxiterated values, the returned iterator returnsNaN. - 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 a provided iterator is iterable, the returned iterator is iterable.
var uniform = require( '@stdlib/random-iter-uniform' );
var iterLog = require( '@stdlib/math-iter-special-log' );
// Create seeded iterators for generating pseudorandom numbers:
var x = uniform( 0.0, 100.0, {
'seed': 1234,
'iter': 10
});
var y = uniform( 0.0, 10.0, {
'seed': 4567,
'iter': 10
});
// Create an iterator which consumes the pseudorandom number iterators:
var it = iterLog( x, y );
// Perform manual iteration...
var r;
while ( true ) {
r = it.next();
if ( r.done ) {
break;
}
console.log( r.value );
}@stdlib/math-base/special/log: baseblogarithm.@stdlib/math-iter/special/log10: create an iterator which evaluates the common logarithm (logarithm with base 10) for each iterated value.@stdlib/math-iter/special/log1p: create an iterator which evaluates the natural logarithm of 1+x for each iterated value.@stdlib/math-iter/special/log2: create an iterator which evaluates the binary logarithm for each iterated value.@stdlib/math-iter/special/pow: create an iterator which evaluates the exponential function.
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.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
