努比。Python中的isinf（）-yiteyi-C++库

这个 努比。isinf（） 函数测试元素是否为+ve或-ve无穷大，并以布尔数组的形式返回结果。

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Syntax: numpy.isinf(array [, out])

参数：

array : [array_like]Input array or object whose          elements, we need to test for  infinityout   : [ndarray, optional]Output array placed         with result. Its type is preserved and        it  must be of the right shape to hold          the output.

返回：

boolean array containing the result. For scalar input, the result is a new boolean with valueTrue if the input is positive or negative infinity; otherwise the value is False. For array input, the result is a boolean array with the same shape as the input and the values are True where the corresponding element of the input is positiveor negative infinity; elsewhere the values are False.

代码1：

python

                           # Python Program illustrating                         
                           # numpy.isinf() method                         
                                      
                           import                                        numpy as geek                         
            
                           print                                        (                                        "Finite : "                                        , geek.isinf(                                        1                                        ),                                        ""                                        )                         
            
                           print                                        (                                        "Finite : "                                        , geek.isinf(                                        0                                        ),                                        ""                                        )                         
            
                           # not a number                         
                           print                                        (                                        "Finite : "                                        , geek.isinf(geek.nan),                                        ""                                        )                         
            
                           #  infinity                         
                           print                                        (                                        "Finite : "                                        , geek.isinf(geek.inf),                                        ""                                        )                         
            
                           print                                        (                                        "Finite : "                                        , geek.isinf(geek.NINF),                                        ""                                        )                         
            
                           x                                        =                                        geek.array([                                        -                                        geek.inf,                                        0.                                        , geek.inf])                         
                           y                                        =                                        geek.array([                                        2                                        ,                                        2                                        ,                                        2                                        ])                         
                           print                                        (                                        "Checking for infinity : "                                        , geek.isinf(x, y))                         

输出：

Finite :  False Finite :  False Finite :  False Finite :  True Finite :  True Checking for infinity :  [1 0 1]

代码2：

python

                           # Python Program illustrating                         
                           # numpy.isinf() method                         
                                      
                           import                                        numpy as geek                         
                                      
                           # Returns True/False value for each element                         
                           b                                        =                                        geek.arange(                                        8                                        ).reshape(                                        2                                        ,                                        4                                        )                         
                                      
                           print                                        (                                        ""                                        ,b)                         
                           print                                        (                                        "Is Infinity : "                                        , geek.isinf(b))                         
            
                           # geek.inf  : Positive Infinity                         
                           # geek.NINF : negative Infinity                         
                           b                                        =                                        [[geek.inf],                         
                                                     [geek.NINF]]                         
                           print                                        (                                        "Is Infinity : "                                        , geek.isinf(b))                         

输出：

 [[0 1 2 3] [4 5 6 7]]Is Infinity :  [[False False False False] [False False False False]]Is Infinity :  [[ True] [ True]]

参考资料： https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.isinf.html#numpy.isinf

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