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There are 2,572 functions in this library.

Fibonacci ( n )

Formula calculation of the number at n in the Fibonacci sequence. No recursion.

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Steve Allen
Richard Carlton Consulting, Inc.
http://www.rcconsulting.com

Sample input:

Fibonacci ( 11 )

Sample output:

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Let ([
	rt5 = 5 ^ ( 1 / 2 )
;	phi = ( 1 + rt5 ) / 2
];	
	Floor ( ( ( phi ^ n )/rt5 ) + 1/2 )
)

Simple Calculation (and fast!) of the number at n in the Fibonacci sequence.

Does not require recursion.

As described here: http://en.wikipedia.org/wiki/Fibonacci_number
(accessed 1/30/2009, 12:00 p.m.)

Comments

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