ValueError: Expected 1D or 2D array, got 0D array instead
时间: 2024-05-29 19:13:07 浏览: 14
This error occurs when you are trying to pass a scalar value (0D array) to a function or method that expects a 1D or 2D array.
For example, if you try to pass a single number to a function that expects an array of numbers, you will get this error.
To fix this error, you need to make sure that you are passing the correct type of input to the function or method. If you need to pass a single value, you can wrap it in an array or use a different function that accepts scalar inputs.
相关问题
ValueError: Expected 1D or 2D array, got 3D array instead
This error message is raised when a function or method expects a 1D or 2D array as input, but instead receives a 3D array.
A 1D array is a linear array with a single row or column, while a 2D array is a matrix with multiple rows and columns. A 3D array, on the other hand, has multiple layers or "slices" of 2D arrays.
The most common cause of this error is passing a 3D array to a function that expects a 2D array. To fix this error, you may need to reshape or flatten the input array to convert it to a 2D or 1D array, depending on the requirements of the function. Alternatively, you may need to modify the function to handle 3D arrays.
builtins.ValueError: Expected 2D array, got 1D array instead:
To fix the `ValueError` you encountered, you need to reshape your 1D array into a 2D array. You can use the `reshape` method from NumPy to accomplish this. Here's an example of how to do it:
```python
import numpy as np
# Assuming your 1D array is called 'arr'
arr_2d = np.reshape(arr, (-1, 1))
# Now 'arr_2d' is a 2D array with a single column
```
In this example, `arr` is your 1D array and `arr_2d` is the reshaped 2D array. The `-1` in the `reshape` method's argument means that the size of that dimension will be inferred based on the size of the original array. The `1` specifies that the reshaped array should have a single column.
Make sure to replace `'arr'` with the actual name of your 1D array in your code.
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