Function reference · Special functions
fib
Computes a Fibonacci number for an integer index.
Integer inputs are evaluated exactly, including negative indices through the negafibonacci relation. Symbolic and non-integer inputs remain as fib(x).
Examples
These examples use Nerdamer Notation.
Evaluate an exact Fibonacci number.
fib(10) // → 55
Use the negafibonacci relation for a negative index.
fib(-4) // → -3
Interfaces
The same operation is available through the interfaces below.
Nerdamer Notation
Use this form inside input passed to nerdamer(...).
fib(arg1)nerdamer.fib
Call the operation through the default nerdamer import.
nerdamer.fib(x: ExpressionInput): ExpressionParameters
| Name | Type | Description |
|---|---|---|
x | ExpressionInput | Fibonacci index. |
Returns
Expression — The exact Fibonacci number for an integer input, or symbolic `fib(x)`.