TypeError: 数组 dtype ('object') 和格式说明符 ('%.18e

问题描述

我有以下数组:

X = np.array([image_array_to_vector1,image_array_to_vector2,image_array_to_vector3,image_array_to_vector4])

X 的打印结果如下:

[array([167, 167, 169, ...,   1,   1,   1], dtype=uint8)
 array([42, 43, 43, ..., 41, 36, 34], dtype=uint8)
 array([0, 0, 0, ..., 0, 0, 0], dtype=uint8)
 array([0, 0, 0, ..., 0, 0, 0], dtype=uint8)]

当我尝试将数据另存为 txt 时:

When I try to save the data as txt:

X_to_text_file = np.savetxt('x.txt',X)

我得到以下信息:

File "/Library/Python/2.7/site-packages/numpy/lib/npyio.py", line 1258, in savetxt
    % (str(X.dtype), format))
TypeError: Mismatch between array dtype ('object') and format specifier ('%.18e')

这是为什么呢?我该如何解决这个问题?

Why is that? How can I solve the issue?

谢谢.

推荐答案

如果没有一些示例数据，复制这个有点困难，但这是我想出的.

It's a little difficult to duplicate this without some example data, but here is what I came up with.

arr = np.array([np.array([1,2,3]), np.array([1,2,3,4])])
arr
array([array([1, 2, 3]), array([1, 2, 3, 4])], dtype=object)
np.savetxt('x.txt', arr)
TypeError: Mismatch between array dtype ('object') and format specifier ('%.18e')

正如@Artier 所指出的，在 将对象数组写入 .txt 文件 指出您可以使用 fmt='%s' 将数组保存为字符串.使用这种格式似乎可以解决我的问题(同样，如果没有数据样本，我无法完全重现您的问题).

As pointed out by @Artier there is a little snippet at the end of the accepted answer in Write object array to .txt file that points out you can just save the array as a string with fmt='%s'. Using this format seems to solve the problem for me (again I can't recreate your issue exactly without a sample of data).

np.savetxt('x.txt', arr, fmt='%s')

我会指出，如果您要保存不同的数组并希望在一个位置保存它们 savez 非常有用.

I would point out that if you are looking to save disparate arrays and want a single location to keep them savez is very useful.

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