|
D.2.2.7 fibonacci
Procedure from library general.lib (see general_lib).
- Usage:
- fibonacci(n); n,p integers
- Return:
- fibonacci(n): nth Fibonacci number, f(0)=f(1)=1, f(i+1)=f(i-1)+f(i)
- computed in characteristic 0, of type string
fibonacci(n,p): f(n) computed in characteristic 0 or prime(p)
- of type number if a basering is present and p=0=char(basering)
or if prime(p)=char(basering)
- of type string else
Example:
| LIB "general.lib";
fibonacci(42); ""; //f(42) of type string (as long integer)
==> 267914296
==>
ring r = 2,x,dp;
number b = fibonacci(42,2); //f(42) of type number, computed in r
b;
==> 0
| See also:
prime.
|