In principle 如果有了整体概念,投奔其他公司,alwasy can写出 if you

have enough time(related to money). Some algorisms(implemented as codes, very optimized) make the excution much efficient, it probably takes while to figure out if from scratch. Like the commerical math library "numerical recipe", many people just use them to speed up fitting calculation instead of write themself. 

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optimized code is a good point -用户名被占用了- 给 用户名被占用了 发送悄悄话 用户名被占用了 的博客首页 (0 bytes) () 12/06/2012 postreply 12:16:10

还有些 code 是基于没公开的内部研究结果的。 -老忽叔叔- 给 老忽叔叔 发送悄悄话 (0 bytes) () 12/06/2012 postreply 17:04:12

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