和目标值比较几乎总会导致失真。
当你考虑度量指标时,应警惕目标值。
它告诉我一个有责任的人,应该要给坐标标值。
It tells me that a responsible person will always label the axes.
When you go from one set of axes to another set of axes, the numbers change.
当你将一组坐标轴变换到另一组坐标轴时,坐标值会发生变化
Actually, the view of vectors we take nowadays is that vectors are associated with a pair of numbers which, on the rotation of axes, transform like this.
实际上,今天我们讲矢量所用的观点是,矢量是和一组坐标值相对应的,在坐标轴旋转的过程中像这样变换
Another way of saying it is, I've actually said, what did I use there, and , It's basically saying there is the first point, there's the second point, add them together and I get that point.
我要去做的是-对不起,再运行一次-好,你可以看到我已经把,这两个点的坐标值加到一块儿了,然后返回了r的值,我会让大家看到我们,实际上得到的是什么,这看起来不错,好,我做了正确的操作。
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