c语言 eps(代表很小的值)全称是什么
答案:3 悬赏:30 手机版
解决时间 2021-03-21 17:13
- 提问者网友：遮云壑
- 2021-03-20 22:09
c语言 eps(代表很小的值)全称是什么
最佳答案
- 五星知识达人网友：十年萤火照君眠
- 2021-03-20 22:19
英文全称为epsilon，其来源为希腊字符ε的读音。
ε是希腊语字母之第五字，艾普西隆的小写。
希腊字符在理工学科中，尤其是数学和物理学上，被大量使用。
而ε在数学中的一种含义就是极小的正数。
于是在英文中 epsilon就有了扩展含义，一个极小的正数。
在C中或matlab中延续了这个含义，并简写成eps。
ε是希腊语字母之第五字，艾普西隆的小写。
希腊字符在理工学科中，尤其是数学和物理学上，被大量使用。
而ε在数学中的一种含义就是极小的正数。
于是在英文中 epsilon就有了扩展含义，一个极小的正数。
在C中或matlab中延续了这个含义，并简写成eps。
全部回答
- 1楼网友：独行浪子会拥风
- 2021-03-20 23:45
EPS is epsilon. The "close-enough" factor.
The question is "is the absolute value close enough?" Where "close enough" is some small number, often something like 1.0E-3.
Depending on how the algorithm converges on the answer, the performance may depend on the size of EPS. Be careful of making EPS too small, because your process could run for hours (or centuries) and not produce a really usable answer.
In this case -- where there's no loop -- the EPS is used because floating point numbers accumulate small errors during multiplication. You can't simply say
a == b
And have it be true in general. So instead we always sayabs( a-b )<= EPS
The question is "is the absolute value close enough?" Where "close enough" is some small number, often something like 1.0E-3.
Depending on how the algorithm converges on the answer, the performance may depend on the size of EPS. Be careful of making EPS too small, because your process could run for hours (or centuries) and not produce a really usable answer.
In this case -- where there's no loop -- the EPS is used because floating point numbers accumulate small errors during multiplication. You can't simply say
a == b
And have it be true in general. So instead we always sayabs( a-b )<= EPS
- 2楼网友：蕴藏春秋
- 2021-03-20 23:29
罗马符号：Ε ε：艾普西龙 Epsilon
这是按照数学上的惯用法命名的。
这是按照数学上的惯用法命名的。
我要举报
如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！
点此我要举报以上问答信息
大家都在看
推荐资讯