Question

How do i get the length of the column in a nD array?

example, i have a nD array called a. when i print a.shape, it returns (1,21). I want to do a for loop, in the range of the column size of the array a. How do i get the value of

Answer 1

You can get the second dimension of the array as:

a.shape[1]

Answer 2

页: 1

In your case:

a.shape
>> (1, 21)


np.size(a,0)
>> 1

np.size(a,1)
>> 21

Answer 3

Using the shape and size works well when you define a two dimension array, but when you define a simple array, these methods do not work For example :

K = np.array([0,2,0])

K.shape?>和numpy.size(K,1)



a. 产生错误:

Traceback (most recent call last):
  File "<ipython-input-46-e09d33390b10>", line 1, in <module>
    K.shape[1]
IndexError: tuple index out of range


<>Solution :

它通过在阵列中增加一个简单选择来解决,

K = np.array([0,2,0],ndmin = 2)


K.shape[0]
Out[56]: 1

K.shape[1]
Out[57]: 3

np.size(K,0)
Out[58]: 1

np.size(K,1)
Out[59]: 3


更多信息:

https://codewithkazem.com/array-shape1-indexeror-tuple-out-of-range/

Answer 4

“entergraph

这是一个简单的例子,你可以效仿。顺便说一句,最后发言应更正为“印本”。

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