f=0 I would write f of x is in big Oh of n squared.

我写下了。

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So you see what it is--it's a measure of how much x deviates from the mean, but it's squared.

你会看到,这个指标,衡量的是x与平均值的偏离,而且这里有个平方

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I take the difference in the x-values, squared, the difference in the y-values, squared, add them up, take the square root of that.

好，是毕达哥拉斯定力对不对？,求x坐标的差，然后平方，求y坐标的差，然后平方，把它们加起来，开平方。

麻省理工公开课 - 计算机科学及编程导论课程节选