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Create an iterator which generates a negaLucas sequence.
The negaLucas numbers are the integer sequence
The sequence is defined by the recurrence relation
which yields
with seed values L_0 = 2 and L_{-1} = -1.
npm install @stdlib/math-iter-sequences-negalucasAlternatively,
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scripttag without installation and bundlers, use the ES Module available on theesmbranch (see README). - If you are using Deno, visit the
denobranch (see README for usage intructions). - For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the
umdbranch (see README).
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var iterNegaLucasSeq = require( '@stdlib/math-iter-sequences-negalucas' );Returns an iterator which generates a negaLucas sequence.
var it = iterNegaLucasSeq();
// returns <Object>
var v = it.next().value;
// returns 2
v = it.next().value;
// returns -1
v = it.next().value;
// returns 3
// ...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.
The function supports the following options:
- iter: number of iterations. Default:
77.
The returned iterator can only generate the first 77 negaLucas numbers, as larger negaLucas numbers cannot be safely represented in double-precision floating-point format. By default, the function returns an iterator which generates all 77 numbers. To limit the number of iterations, set the iter option.
var opts = {
'iter': 2
};
var it = iterNegaLucasSeq( opts );
// returns <Object>
var v = it.next().value;
// returns 2
v = it.next().value;
// returns -1
var bool = it.next().done;
// returns true- If an environment supports
Symbol.iterator, the returned iterator is iterable.
var iterNegaLucasSeq = require( '@stdlib/math-iter-sequences-negalucas' );
// Create an iterator:
var it = iterNegaLucasSeq();
// Perform manual iteration...
var v;
while ( true ) {
v = it.next();
if ( v.done ) {
break;
}
console.log( v.value );
}@stdlib/math-base/special/negalucas: compute the nth negaLucas number.@stdlib/math-iter/sequences/lucas: create an iterator which generates a Lucas sequence.@stdlib/math-iter/sequences/negafibonacci: create an iterator which generates a negaFibonacci sequence.
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.
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