问题描述
在Go中获得机器epsilon的最简单方法是什么?浮点数的其他方面(例如精度，最小指数，最大指数，摆动等)又如何呢?
What is the easiest way to get the machine epsilon in Go? What about other aspects of floating point numbers such as precision, min exponent, max exponent, wobble, etc?
我意识到，有一个math/const包，其中包含针对不同浮点类型的max和min( http://golang.org/src/pkg/math/const.go )，但没有其他信息.
I realize that there is the math/const package with the max and min for the different float types (http://golang.org/src/pkg/math/const.go), but no other information.
我想知道的一个原因是，对于给定的计算量，我可以验证该机器可以达到的最高精度，这样我就不会早退，也不会尝试更长的时间.
One reason I would like to know is to verify that I've reached the maximum precision for a given calculation that the machine can do so that I don't quit to early or try longer then needed.
另一个只是出于好奇.
谢谢
出于乐趣，我在学校里查阅了一些笔记，以了解如何手动计算epsilon的乐趣，这是c ++的粗略翻译 http://play.golang.org/p/XOXwIdNfsa 享受
For the fun I looked up in some notes from school on how to calculate the epsilon manually for fun and here is a rough translation from c++ http://play.golang.org/p/XOXwIdNfsa enjoy
来自下方的评论(感谢您使用一种更惯用的方式来找到epsilon):
comment from below (thanks for a more idiomatic way of finding epsilon):
使用epsilon := math.Nextafter(1, 2) - 1 游乐场 – 3月5日8:07
Use epsilon := math.Nextafter(1, 2) - 1 Playground – Nick Craig-Wood Mar 5 at 8:07
推荐答案
未定义，我发现问题已在问题跟踪器上解决为按预期工作":
It's not defined, I found the issue resolved as "working as intended" on the issue tracker:
https://code.google.com/p/go/issues/detail?id = 966
建议似乎是使用math.Nextafter来导出所需的值.
The suggestion seems to be to use math.Nextafter to derive the value if you need it.
具体来说，公式为math.Nextafter(1.0,2.0)-1.0(第二个参数可以是大于1.0的任何数字).
Specifically, the formula is math.Nextafter(1.0,2.0)-1.0 (the second argument can be any number greater than 1.0).
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