no, I copied the answer from 脑坛to show you. after posting

来源: 戏雨飞鹰 于 2010-01-10 20:21:28 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (38 bytes)
回答: i'm wrong. the value of exp(log2) id not 10:) 由 戏雨飞鹰 于 2010-01-10 19:29:45

here, I found it was totally wrong:).

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