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defmodule Standard do | |
def fib(0), do: 0 | |
def fib(1), do: 1 | |
def fib(n), do: fib(n-1) + fib(n-2) | |
end | |
defmodule Optimized do | |
def fib(0), do: 0 | |
def fib(1), do: 1 | |
def fib(1, current, _), do: current | |
def fib(n, current \\ 1, previous \\ 0) do | |
fib(n - 1, current + previous, current) | |
end | |
end | |
defmodule Matrix do | |
def fib(n) do | |
eigen1 = (1 + :math.sqrt(5))/2 | |
eigen2 = (1 - :math.sqrt(5))/2 | |
((1 / :math.sqrt(5)) * (:math.pow(eigen1, n) - :math.pow(eigen2, n))) | |
end | |
end | |
:eprof.start | |
:eprof.start_profiling([self]) | |
Standard.fib(20) | |
Optimized.fib(20) | |
Matrix.fib(20) | |
:eprof.stop_profiling() | |
:eprof.analyze() | |
# ****** Process <0.48.0> -- 100.00 % of profiled time *** | |
# FUNCTION CALLS % TIME [uS / CALLS] | |
# -------- ----- --- ---- [----------] | |
# 'Elixir.Matrix':fib/1 1 0.03 1 [ 1.00] | |
# 'Elixir.Optimized':fib/3 20 0.05 2 [ 0.10] | |
# 'Elixir.Standard':fib/1 21891 99.34 3636 [ 0.17] |
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function fib(n) { | |
return n <= 2 ? 1 : fib(n-2) + fib(n-1); | |
} |
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- (NSUInteger)fib:(NSUInteger)n { | |
if (n < 2) { | |
return 1; | |
} | |
return [self fib:(n - 1)] + [self fib:(n - 2)]; | |
} |
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function fib($n) { | |
if ($n <= 2) { | |
return 1; | |
} | |
return fib($n - 2) + fib($n - 1); | |
} |
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def fib(n) | |
return 1 if n <= 2 | |
fib(n - 2) + fib(n - 1) | |
end |
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func fib(n: Int) -> Int { | |
return n <= 2 ? 1 : fib(n - 2) + fib(n - 1) | |
} | |
fib(10) |
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