Linspace与范围 [英] Linspace vs range

问题描述

我想知道哪种样式更好/更有效:

I was wondering what is better style / more efficient:

x = linspace(-1, 1, 100);

或

x = -1:0.01:1;

推荐答案

正如奥利·查尔斯沃思(Oli Charlesworth)所提到的，在linspace中，将区间[a,b]划分为N个点，而对于:形式，您可以-以指定的步长(默认值为1)从a跳出，直到达到b.

As Oli Charlesworth mentioned, in linspace you divide the interval [a,b] into N points, whereas with the : form, you step-out from a with a specified step size (default 1) till you reach b.

要记住的一件事是，linspace 总是包含端点，而:形式将包含第二个端点，只有当步长足够大时在最后一步落在它上面，它将落空.示例:

One thing to keep in mind is that linspace always includes the end points, whereas, : form will include the second end-point, only if your step size is such that it falls on it at the last step else, it will fall short. Example:

0:3:10

ans = 

     0     3     6     9

也就是说，当我使用两种方法时，取决于我需要做的事情.如果我需要做的只是采样固定点数的间隔(并且我不在乎步长)，则使用linspace.

That said, when I use the two approaches depends on what I need to do. If all I need to do is sample an interval with a fixed number of points (and I don't care about the step-size), I use linspace.

在很多情况下，我不在乎它是否不落在最后一点上，例如，当使用极坐标时，我不需要最后一点，因为2*pi与0.在那里，我使用0:0.01:2*pi.

In many cases, I don't care if it doesn't fall on the last point, e.g., when working with polar co-ordinates, I don't need the last point, as 2*pi is the same as 0. There, I use 0:0.01:2*pi.

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