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1.1 Vectors We have n separate numbers \(v_1、v_2、v_3,...,v_n\),that produces a n-dimensional vector \(v\),and \(v\) is represented by an arrow. \[ v=\ 阅读全文
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基本的统计方法 Method Description count Number of non-NA values describe Compute set of summary statistics for Series or each DataFrame column min,max Comput 阅读全文
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Series和DataFrame对象与Numpy数组和标准Python字典的数据索引和选择模式一样。 字典形式选择和索引 Series In [1]: import pandas as pd In [2]: data = pd.Series([0.25,0.5,0.75,1.0],index=['a 阅读全文
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plt.legend()和ax.legend()参数设置 自动会将每条线的标签与其风格、颜色进行匹配。 plt.legend(*args, **kwargs) Place a legend on the axes. Call signatures:: legend() legend(labels) 阅读全文