So for example I defined p, remember back over here, as a Cartesian point, but I can actually ask for its polar form.

我可以要求返回它的极坐标形式，这里对我是可访问的，好，这很棒，请再记另外一个为什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

Right, and just to get a sense of this, let's look at a simple little example, so on your hand-out, you'll see I've got a little piece of code that says assuming I've got one of these points, I want to do things with it, for example I might want to add them together.

这些数组中的一个，你怎么能够知道，它是哪种类型的呢？,你怎么知道它是以笛卡尔坐标,表示的还是以极坐标,形式表示的呢？,你没有可以用来区分的东西，你没有说明这种信息,聚集实际上的意义。

麻省理工公开课 - 计算机科学及编程导论课程节选

I could say I want to change the radius of this particular thing.

如果我去看看,这个点的极坐标形式。

麻省理工公开课 - 计算机科学及编程导论课程节选

If I now say, I'm going to go ahead and change the radius of this, something, my polar form did it right, but what happened to the Cartesian form?

如果我现在说，我要去改变这里的半径,一些这样的操作，我的极坐标形式，进行了正确的改动？

麻省理工公开课 - 计算机科学及编程导论课程节选

And I think in the polar one I said, if, what did I do there, I said, yeah, again if the x and y are greater than the other one, I'm going to return them to it.

然后我要返回一些值，我认为在极坐标的形式下我说过，如果，我在这里做了什么来着,我说过，对，再说一次，如果x和y坐标。

麻省理工公开课 - 计算机科学及编程导论课程节选

So what I'm leading up to here is that we've got a problem.

假设实际上p1和p2是,我用极坐标形式表示的。

麻省理工公开课 - 计算机科学及编程导论课程节选