努比。Python中的log10（）-yiteyi-C++库

关于： 努比。log10（arr，out=None，*，其中=True，casting=’same_kind’，order=’K’，dtype=None，ufunc’log10’）： 这个数学函数帮助用户计算 x的10进制对数 其中x属于所有输入数组元素。

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参数：

array    : [array_like]Input array or object.
out      : [ndarray, optional]Output array with same dimensions as Input array, 
         placed with result.
**kwargs : allows you to pass keyword variable length of argument to a function. 
         It is used when we want to handle named argument in a function.
where    : [array_like, optional]True value means to calculate the universal 
         functions(ufunc) at that position, False value means to leave the value in the 
         output alone.

返回：

An array with Base-10 logarithmic value of x; 
where x belongs to all elements of input array.

代码1：工作

                     # Python program explaining                   
                     # log10() function                   
                             
                     import                               numpy as np                   
                             
                     in_array                               =                               [                               1                               ,                               3                               ,                               5                               ,                               10                               *                               *                               8                               ]                   
                     print                               (                               "Input array : "                               , in_array)                   
                             
                     out_array                               =                               np.log10(in_array)                   
                     print                               (                               "Output array : "                               , out_array)                   
                             
                             
                     print                               (                               "np.log10(4**4) : "                               , np.log10(                               100                               *                               *                               4                               ))                   
                     print                               (                               "np.log10(2**8) : "                               , np.log10(                               10                               *                               *                               8                               ))                   

输出：

Input array :  [1, 3, 5, 100000000]
Output array :  [ 0.          0.47712125  0.69897     8.        ]

np.log10(4**4) :  8.0
np.log10(2**8) :  8.0

代码2：图形表示

                     # Python program showing                   
                     # Graphical representation of                   
                     # log10() function                   
                             
                     import                               numpy as np                   
                     import                               matplotlib.pyplot as plt                   
                             
                     in_array                               =                               [                               1                               ,                               2                               ,                               3                               ,                               4                               ,                               5                               ]                   
                     out_array                               =                               np.log10(in_array)                   
                             
                     print                               (                               "out_array : "                               , out_array)                   
                             
                     plt.plot(in_array, in_array, color                               =                               'blue'                               , marker                               =                               "*"                               )                   
                             
                     # red for numpy.log10()                   
                     plt.plot(out_array, in_array, color                               =                               'red'                               , marker                               =                               "o"                               )                   
                     plt.title(                               "numpy.log10()"                               )                   
                     plt.xlabel(                               "out_array"                               )                   
                     plt.ylabel(                               "in_array"                               )                   
                     plt.show()                   

输出：

out_array :  [ 0.          0.30103     0.47712125  0.60205999  0.69897   ]

图片[1]-努比。Python中的log10（）-yiteyi-C++库 参考资料： https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.log10.html#numpy.log10 .

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