My understanding is this is a pretty huge field : http://en.wikipedia.org/wiki/Computational_finance http://en.wikipedia.org/wiki/Computational_finance and that

My understanding is this is a pretty huge field : http://en.wikipedia.org/wiki/Computational_finance http://en.wikipedia.org/wiki/Computational_finance and that if you try to roll your own, you are computing against a variety of math and CS phds that big trading firms hire to do analytics.