如何从一个numpy数组构造一个ndarray？Python
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How to construct a ndarray from a numpy array? python
提问by alvas
I can't seem to convert it into an ndarrayin numpy, i've read http://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.htmlbut it didn't show me how i can convert my input data as shown below into an ndarray.
我似乎无法将它转换为ndarraynumpy，我已经阅读了http://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html但它没有告诉我我怎么做将我的输入数据如下所示转换为ndarray.
How to construct a ndarray from a numpy array or a list of integer lists?*What's the difference between ndarray and array?* I could just use an arraytype right?
如何从 numpy 数组或整数列表列表构造 ndarray？* ndarray 和数组有什么区别？* 我可以只使用一种array类型，对吗？
I have a list of integer counts like this
我有一个像这样的整数计数列表
[[1, 2, 4, 1, 5],
[6, 0, 0, 0, 2],
[0, 0, 0, 1, 0]]
And i manage to use this code to create a np.arrayas shown in http://docs.scipy.org/doc/numpy/reference/generated/numpy.array.html#numpy.array
我设法使用此代码创建一个np.array如http://docs.scipy.org/doc/numpy/reference/generated/numpy.array.html#numpy.array所示
import numpy as np
x = [[1, 2, 4, 1, 5],
[6, 0, 0, 0, 2],
[0, 0, 0, 1, 0]]
print np.array(x)
[out]:
[出去]：
[[1 2 4 1 5]
[6 0 0 0 2]
[0 0 0 1 0]]
But I can't change it into a np.ndarraywith this code:
但是我不能np.ndarray用这个代码把它改成一个：
import numpy as np
x = [[1, 2, 4, 1, 5],
[6, 0, 0, 0, 2],
[0, 0, 0, 1, 0]]
print np.ndarray(x)
I got an error:
我有一个错误：
Traceback (most recent call last):
File "/home/alvas/workspace/sklearntut/test.py", line 7, in <module>
print np.ndarray(x)
TypeError: an integer is required
How do I create a np.ndarray with the list of integer counts i've got?What integer is the TypeError talking about?
如何使用我得到的整数计数列表创建 np.ndarray ？TypeError 谈论的是什么整数？
采纳答案by Fred Foo
An ndarrayisa NumPy array.
Anndarray是一个 NumPy 数组。
>>> x = np.array([1, 2, 3])
>>> type(x)
<type 'numpy.ndarray'>
The difference between np.ndarrayand np.arrayis that the former is the actual type, while the latter is a flexible shorthand function for constructing arrays from data in other formats. The TypeErrorcomes your use of np.arrayarguments to np.ndarray, which takes completely different arguments (see docstrings).
np.ndarray和之间的区别在于，np.array前者是实际类型，而后者是一种灵活的速记函数，用于从其他格式的数据构造数组。在TypeError谈到您使用的np.array参数np.ndarray，这需要完全不同的参数（见文档字符串）。
回答by Andarin
Though the accepted response is correct, that didn't help me actually create a 1-dimensional array of arrays.
尽管接受的响应是正确的，但这并没有帮助我实际创建一个一维数组。
As this thread is the first answer at Google, I post my work around, even if it isn't elegant solution (please don't hesitate to point one out to me):
由于这个线程是谷歌的第一个答案，我发布了我的工作，即使它不是优雅的解决方案（请不要犹豫向我指出一个）：
import numpy as np
# Create example array
initial_array = np.ones(shape = (2,2))
# Create array of arrays
array_of_arrays = np.ndarray(shape = (1,), dtype = "object")
array_of_arrays[0] = initial_array
Be aware that array_of_arraysis in this case mutable, i.e. changing initial_arrayautomatically changes array_of_arrays.
请注意，array_of_arrays在这种情况下是可变的，即initial_array自动更改更改array_of_arrays。
