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Magnitude这个词

7788
2017年4月17日 / 26次阅读
标签:英语

Magnitude这个词好熟悉,但是就是不知道其准确的含义。

 

magnitude [ 'mæɡnitju:d ]  n.

1, the property of relative size or extent (whether large or small)

"they tried to predict the magnitude of the explosion"; " about the magnitude of a small pea"

2, a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10

同义词: order of magnitude

relative importance

"a problem of the first magnitude"

 

magnitude /ˈmæɡnɪˌtjuːd/ CET6 TEM8

1.  N-UNCOUNT If you talk about the magnitude of something, you are talking about its great size, scale, or importance. (尺寸、规模、重要性等) 大的程度

例: An operation of this magnitude is going to be difficult. 一个这么大的手术会很难的。

2. PHRASE You can use order of magnitude when you are giving an approximate idea of the amount or importance of something. 重要级; 数量级

例:America and Russia do not face a problem of the same order of magnitude as Japan. 美俄两国没有面临与日本同样的重要级别的问题。

 

计算机算法的时间复杂度分析,使用的数学符号就是一个大写的O,就是Order of magnitude的第一个字母,表示算法的时间复杂度是问题规模N的什么样的数量级关系,是一个粗略的估计。

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