但是你也可以继续只用法向量的。

But you can also just stay with a normal vector.

youdao

这个向量的所有分量就是这些偏导。

OK, so it's the vector whose components are the partials.

youdao

从而法向量的方向是竖直向上或向下的。

The normal vector is just sticking straight up or straight down.

youdao

So we see that I've doubled the size of the vector but I've much more than doubled the number of calls.

所以我们看到我,把向量的大小翻倍了,但是我调用的次数,不仅仅是翻倍了。

麻省理工公开课 - 计算机科学及编程导论课程节选

So this particular vector, you probably can't even see the whole thing on your screen. Well, it's got 40 items in it.

这个特殊的向量，在你的屏幕上可能都看不全,好的，它一共包括40件物品。

麻省理工公开课 - 计算机科学及编程导论课程节选

i It takes i, which is in some sense 1 the length of those vectors, minus 1, because of the way Python works.

还有i，某种意义上,是那些向量的长度减，减1由于Python的工作方式。

麻省理工公开课 - 计算机科学及编程导论课程节选