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Full Discussion: Shell script to generate Fibonacci series using recursion
Top Forums Shell Programming and Scripting Shell script to generate Fibonacci series using recursion Post 302378787 by jstrangfeld on Tuesday 8th of December 2009 08:27:52 PM
Old 12-08-2009
Wow quite interesting results. Wonder if its some oddity because I am running this in cygwin. I am using a centrino2 vpro2

I changed the 3 scripts to use $1 instead of a read and the times required are vastly different.

Code:
None recursive script I threw together:
$ time ./fibo.sh 10
Fibonacci (10)=55

real    0m0.055s
user    0m0.046s
sys     0m0.030s

Original script from post #2:
$ time ./fibo2.sh 10
0 1 1 2 3 5 8 13 21 34 55

real    0m18.554s
user    0m8.199s
sys     0m4.926s

Script posted by scrutinizer in post #6, well I had to slightly change your while loop cause my shell 
could not digest the inline declaration of "i" so mine looks like this at the bottom of the file:
while [ $i -lt $1 ]
do
let i=i+1
  Fibonacci $i
done
echo

$ time ./fibo3.sh 10
1 1 2 3 5 8 13 21 34 55

real    0m11.508s
user    0m7.953s
sys     0m4.610s

 

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LEARN ABOUT DEBIAN

math::fibonacci

Math::Fibonacci(3pm)					User Contributed Perl Documentation				      Math::Fibonacci(3pm)

NAME

       Math::Fibonacci - Fibonacci numbers.

VERSION

	   $Revision: 1.5 $

SYNOPSIS

	   use Math::Fibonacci qw(term series decompose);

	   my $term = term ( 42 );
	   my @series = series ( 42 );
	   my @sum = decompose ( 65535 );

DESCRIPTION

       This module provides a few functions related to Fibonacci numbers.

EXPORTS ON REQUEST

       term(), series() decompose(), isfibonacci()

FUNCTIONS

       term($n)
	   Returns the $n-th term of the Fibonacci sequence. The term is computed using the fast algorithm: "F(n) ~ g^n/sqrt(5)", where g is the
	   golden ratio and ~ means "take the nearest integer".

       series($n)
	   Computes and returns the first $n Fibonacci numbers.

       decompose($int)
	   Decomposes $int into the sum of Fibonacci numbers. Returns the list of Fibonacci numbers.

       isfibonacci($int)
	   Returns the sequence number of $int if it is a Fibonacci number or a non-true value if it is not.

AUTHOR

       Vipul Ved Prakash, <mail@vipul.net>

LICENSE

       Copyright (c) 1999-2001, Vipul Ved Prakash.

       This code is free software; you can redistribute it and/or modify it under the ARTISTIC license (a copy is included in the distribution) or
       under the same terms as Perl itself.

perl v5.8.8							    2008-03-09						      Math::Fibonacci(3pm)
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