我如何计算数组中的值与python中数组的总和之比? [英] How can I calculate the ratio of a value in array to the sum of array in python?

问题描述

我有一个这样的数组:

array =[[1,2,3],
        [5,3,4],
        [6,7,2]]

我想为每个成员计算它们与行总和的比率.

and for each member I would like to calculate the ratio of them to the sum of the row.

因此，我在提出的样本中提出问题的结果是:

Therefore, the result of my question in proposed sample is:

result = [[1/(1+2+3),2/(1+2+3),3/(1+2+3)],
          [5/(5+3+4),3/(5+3+4),4/(5+3+4)],
          [6/(6+7+2),7/(6+7+2),2/(6+7+2)]]

我编写了以下代码，但由于两个运算符的形状不同而无法正常工作

I write the following code but it does not work because two operators have different shape:

array/array.sum(array, axis=1)

推荐答案

您可以在进行求和时指定keepdim=True，然后有一个二维数组作为结果，而每行代表行总和:

You can specify keepdim=True while doing the sum, and then you have a 2d array as result while each row stands for the row sum:

array = np.array([[1,2,3],
        [5,3,4],
        [6,7,2.]])

array/array.sum(1, keepdims=True)
#array([[ 0.16666667,  0.33333333,  0.5       ],
#       [ 0.41666667,  0.25      ,  0.33333333],
#       [ 0.4       ,  0.46666667,  0.13333333]])

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