time-to-botec/js/node_modules/@stdlib/math/base/special/negafibonacci
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Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00
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negaFibonacci

Compute the nth negaFibonacci number.

The negaFibonacci numbers are the integer sequence

NegaFibonacci sequence

The sequence is defined by the recurrence relation

NegaFibonacci sequence recurrence relation

which yields

NegaFibonacci relationship to Fibonacci numbers

with seed values F_0 = 0 and F_{-1} = 1.

Usage

var negafibonacci = require( '@stdlib/math/base/special/negafibonacci' );

negafibonacci( n )

Computes the nth negaFibonacci number.

var v = negafibonacci( 0 );
// returns 0

v = negafibonacci( -1 );
// returns 1

v = negafibonacci( -2 );
// returns -1

v = negafibonacci( -3 );
// returns 2

v = negafibonacci( -78 );
// returns -8944394323791464

If n < -78, the function returns NaN, as larger negaFibonacci numbers cannot be safely represented in double-precision floating-point format.

var v = negafibonacci( -79 );
// returns NaN

If not provided a nonpositive integer value, the function returns NaN.

var v = negafibonacci( -3.14 );
// returns NaN

v = negafibonacci( 1 );
// returns NaN

If provided NaN, the function returns NaN.

var v = negafibonacci( NaN );
// returns NaN

Examples

var negafibonacci = require( '@stdlib/math/base/special/negafibonacci' );

var v;
var i;

for ( i = 0; i > -79; i-- ) {
    v = negafibonacci( i );
    console.log( v );
}