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Python数据分析(中英对照)·Building and Examining NumPy Arrays 构建和检查 NumPy 数组

NumPy provides a couple of ways to construct arrays with fixed,start, and end values, such that the other elements are uniformly spaced between them. NumPy提供了两种方法来构造具有固定值、起始值和结束值的数组,以便其他元素在它们之间均匀分布。 To construct an array of 10 linearly spaced elements starting with 0 and ending with 100, we can use the NumPy linspace function. 要构造一个由10个线性间隔元素组成的数组,从0开始到100结束,我们可以使用NumPy linspace函数。 In this case, I’m going to type np.linspace. 在本例中,我将键入np.linspace。 The first argument is the starting point, which is 0. 第一个参数是起点,即0。 The second is the ending point, which will be included in the NumPy array that gets generated. 第二个是结束点,它将包含在生成的NumPy数组中。 And the final argument is the number of points I would like to have in my array. 最后一个参数是数组中的点数。 In this case, NumPy has created a linearly spaced array starting at 0 and ending at 100. 在本例中,NumPy创建了一个从0开始到100结束的线性间隔阵列。 Now, to construct an average of 10 logarithmically spaced elements between 10 and 100, we can do the following. 现在,要构造10个10到100之间的对数间隔元素的平均值,我们可以执行以下操作。 In this case we use the NumPy logspace command. 在本例中,我们使用NumPy logspace命令。 But now careful, the first argument that goes into logspace is going to be the log of the starting point. 但是现在要小心,进入日志空间的第一个参数将是起点的日志。 If you want the sequence to start at 10, the first argument has to be the log of 10 which is 1. 如果希望序列从10开始,则第一个参数必须是10的log,即1。 The second argument is the endpoint of the array, which is 100. 第二个参数是数组的端点,它是100。 And again, we need to put in the log of that, which is 2. 再一次,我们需要把它放到日志中,也就是2。 And the third argument as before, is the number of elements in our array. 和前面一样,第三个参数是数组中的元素数。 in this case, what NumPy has constructed is an array consisting of 10 elements where the first element is 10 and the last element is 100. 在本例中,NumPy构造了一个由10个元素组成的数组,其中第一个元素是10,最后一个元素是100。 All of the other elements are uniformly spaced between those two extreme points in the logarithmic space. 所有其他元素均匀分布在对数空间的两个端点之间。 To construct array of ten logarithmically spaced elements between numbers say 250 and 500,

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