R的round問題 - 经管之家

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ariman911 发表于 2013-4-23 06:17:11 |AI写论文

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> round(1.12345,digits=4)
[1] 1.1235
> round(0.12345,digits=4)
[1] 0.1234

Why?

這是唯一的特例,還是冰山一角?

最佳答案

dxystata 查看完整内容

Note that for rounding off a 5, the IEC 60559 standard is expected to be used, ‘go to the even digit’. Therefore round(0.5) is 0 and round(-1.5) is -2. However, this is dependent on OS services and on representation error (since e.g. 0.15 is not represented exactly, the rounding rule applies to the represented number and not to the printed number, and so round(0.15, 1) could be either 0.1 or 0.2 ...

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关键词：ROUND und 冰山一角 Dig its 冰山一角

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dxystata 发表于 2013-4-23 06:17:12

Note that for rounding off a 5, the IEC 60559 standard is expected to be used, ‘go to the even digit’. Therefore round(0.5) is 0 and round(-1.5) is -2. However, this is dependent on OS services and on representation error (since e.g. 0.15 is not represented exactly, the rounding rule applies to the represented number and not to the printed number, and so round(0.15, 1) could be either 0.1 or 0.2).