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The range method accepts a starting index, as well as a step size.
range方法接受起始索引以及步长。
Note that if the step attribute is omitted, the step size defaults to 1.
如果省略了step属性,那么步长缺省为1。
In this example, I create a vector (t) with values ranging from 0 to 2pi (with a step size of 0.2).
在这个例子中,先是创建了一个向量(t),其值的范围从0到2pi(步进大小为0.2)。
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