Subtract a constant from a vector's magnitude (shorten the vector) without using square root?

减去一个常数向量的大小（缩短向量），而不使用平方根?。

youdao

Obviously — and that's a bad way of saying it, I said constant the previous time — in the linear case, it's subtract by certain amount.

这么描述很不准确，我之前在，线性算法中也说了常数，它是每次减少固定的量。

youdao

Obviously-- and that's a bad way of saying it, I said constant the previous time-- in the linear case, it's subtract by certain amount.

这么描述很不准确，我之前在，线性算法中也说了常数,它是每次减少固定的量。

麻省理工公开课 - 计算机科学及编程导论课程节选