Python|熊猫 Panel.cummax()
在 Pandas 中,Panel 是一个非常重要的 3D 数据容器。 3 个轴的名称旨在为描述涉及面板数据的操作提供一些语义含义,特别是面板数据的计量经济学分析。
Panel.cummax()
函数用于返回包含累积最大值的相同大小的 DataFrame 或 Series。
Syntax: Panel.cummax(axis=None, skipna=True, *args, **kwargs)
Parameters:
axis : The index or the name of the axis. 0 is equivalent to None or ‘index’.
skipna : Exclude NA/null values. If an entire row/column is NA, the result will be NA.
Returns: Cummax of DataFrame or Panel
代码#1:
# importing pandas module
import pandas as pd
import numpy as np
df1 = pd.DataFrame({'a': ['Geeks', 'For', 'geeks', 'for', 'real'],
'b': [11, 1.025, 333, 114.48, 1333]})
data = {'item1':df1, 'item2':df1}
# creating Panel
panel = pd.Panel.from_dict(data, orient ='minor')
print(panel, "\n")
print(panel['b'])
print("\n", panel['b'].cummax(axis = 0))
输出:
代码#2:
# importing pandas module
import pandas as pd
import numpy as np
df1 = pd.DataFrame({'a': ['Geeks', 'For', 'geeks'],
'b': np.random.randn(3)})
data = {'item1':df1, 'item2':df1}
# creating Panel
panel = pd.Panel.from_dict(data, orient ='minor')
print(panel, "\n")
print(panel['b'])
df2 = pd.DataFrame({'b': [11, 12, 13]})
print("\n", panel['b'].cummax(axis = 0))
输出: