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// get_prices(List("GOOG", "AAPL"), 2010 to 2012)
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val urban_prices = List(List(Some(311.349976), Some(20.544939)),
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List(Some(300.222351), Some(31.638695)),
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List(Some(330.555054), Some(39.478039)))
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assert(get_deltas(urban_prices) == List(List(Some(-0.03573992567129673), Some(0.539975124774038)),
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List(Some(0.10103412653643493), Some(0.24777709700099845))))
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//get_prices(List("BIDU"), 2004 to 2008)
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val urban_prices2 = List(List(None), List(None),
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List(Some(6.35)), List(Some(12.241)),
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List(Some(38.188)))
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assert(get_deltas(urban_prices2) == List(List(None), List(None),
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List(Some(0.9277165354330709)),
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List(Some(2.119679764725104))))
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