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{{alias}}( n )
Computes the nth negaFibonacci number.
The negaFibonacci numbers follow the recurrence relation
F_{n-2} = F_{n} - F_{n-1}
with seed values F_0 = 0 and F_{-1} = 1.
If `|n|` is greater than `78`, the function returns `NaN` as larger
negaFibonacci numbers cannot be accurately represented due to limitations of
double-precision floating-point format.
If not provided a non-positive integer value, the function returns `NaN`.
If provided `NaN`, the function returns `NaN`.
Parameters
----------
n: integer
Input value.
Returns
-------
y: integer
NegaFibonacci number.
Examples
--------
> var y = {{alias}}( 0 )
0
> y = {{alias}}( -1 )
1
> y = {{alias}}( -2 )
-1
> y = {{alias}}( -3 )
2
> y = {{alias}}( -4 )
-3
> y = {{alias}}( -79 )
NaN
> y = {{alias}}( -80 )
NaN
> y = {{alias}}( NaN )
NaN
See Also
--------
|
