ax=plt.subplot(111)

This line of code creates a subplot in the current figure with 1 row, 1 column, and a subplot index of 1. The variable `ax` is assigned to this subplot object, which can be used to modify properties of the subplot such as the x and y axis limits, title, axis labels, etc.

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ax= plt.subplot

在这个代码中，ax = plt.subplot()的作用是创建一个包含单个子图的figure和axes对象。这个子图是一个标准的2D坐标轴对象，可以用来绘制图形和设置图形属性。 [3]<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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ax = plt.subplot(111)

This line of code creates a subplot with one row and one column, and sets the current axis to ax. The number 111 is a shorthand for specifying the subplot layout. The first digit represents the number of rows, the second digit represents the number of columns, and the third digit represents the index of the current subplot, counting from left to right and top to bottom. Since there is only one subplot in this case, the shorthand is 111.