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@samuell
Created September 6, 2014 01:01
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defmodule ATGCCount do
def count(sequence), do: cnt(String.to_char_list(sequence),0,0)
def cnt([65|t],at,gc), do: cnt(t,at+1,gc)
def cnt([84|t],at,gc), do: cnt(t,at+1,gc)
def cnt([71|t],at,gc), do: cnt(t,at,gc+1)
def cnt([67|t],at,gc), do: cnt(t,at,gc+1)
def cnt([62|_],at,gc), do: {at,gc}
def cnt([],at,gc), do: {at,gc}
def cnt(_,0,0), do: {0,0}
def cnt([_|t], at, gc), do: cnt(t,at,gc)
end
defmodule GCCount do
def process do
filename = "chry.fa"
if File.exists?(filename) do
stream = File.stream!(filename, [:read_ahead, :raw], :line)
Enum.reduce stream, {0, 0}, fn(line, {at_acc, gc_acc}) ->
{at, gc} = ATGCCount.count(line)
{at_acc + at, gc_acc + gc}
end
end
end
def gc_ratio do
{at, gc} = process
case {gc, at} do
{0, 0} -> 0
{at, gc} -> gc/(gc+at)
{_,_} -> 0
end
end
end
@samuell
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samuell commented Jun 25, 2015

All: For reference, the data file used here is available at: http://bit.ly/ychromo
Also see the discussion about these tests on the meetup page: http://www.meetup.com/stockholm-elixir/events/203279212/

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