在Python Pandas中查找某一列的指数

让我们看看如何在Pandas Dataframe中找到一个列的指数。首先，让我们创建一个Dataframe。

# importing pandas and
# numpy libraries
import pandas as pd
import numpy as np
  
# creating and initializing a list
values= [ ['Rohan', 5, 50.59], ['Elvish', 2, 90.57],
         ['Deepak', 10, 98.51], ['Soni', 4, 40.24],
         ['Radhika', 1, 99.05], ['Vansh', 15, 85.56] ]
 
# creating a pandas dataframe
df = pd.DataFrame(values, columns = ['Name',
                                     'University_Rank',
                                     'University_Marks'])
 
# displaying the data frame
df

输出:

通过使用numpy.exp()函数可以找出任何列的指数。这个函数计算输入数组/系列的指数。

语法: numpy.exp(array, out = None, where = True, casting = ‘same_kind’, order = ‘K’, dtype = None)

返回：一个包含输入数组/系列所有元素的指数的数组。

例子1：寻找单列的指数（整数值）。

# importing pandas and
# numpy libraries
import pandas as pd
import numpy as np
  
# creating and initializing a list
values= [ ['Rohan', 5, 50.59], ['Elvish', 2, 90.57],
         ['Deepak', 10, 98.51], ['Soni', 4, 40.24],
         ['Radhika', 1, 99.05], ['Vansh', 15, 85.56] ]
 
# creating a pandas dataframe
df = pd.DataFrame(values, columns = ['Name',
                                     'University_Rank',
                                     'University_Marks'])
 
# finding the exponential value
# of column using np.exp() function
df['exp_value'] = np.exp(df['University_Rank'])
 
# displaying the data frame
df

输出:

例子2：寻找单列的指数（浮点数）。

# importing pandas and
# numpy libraries
import pandas as pd
import numpy as np
  
# creating and initializing a list
values= [ ['Rohan', 5, 50.59], ['Elvish', 2, 90.57],
         ['Deepak', 10, 98.51], ['Soni', 4, 40.24],
         ['Radhika', 1, 99.05], ['Vansh', 15, 85.56] ]
 
# creating a pandas dataframe
df = pd.DataFrame(values, columns = ['Name',
                                     'University_Rank',
                                     'University_Marks'])
 
# finding the exponential value
# of column  using np.exp() function
df['exp_value'] = np.exp(df['University_Marks'])
 
# displaying the data frame
df

输出: