ValueError: cannot reshape array of size 18 into shape (27,1)
时间: 2024-10-08 14:17:45 浏览: 19
这个`ValueError`是在Python的NumPy库中常见的,当你试图将一个一维数组重塑(reshape)成二维数组,并指定的形状与原始数组的元素数目不符时会出现这种情况。例如,如果你有一个包含18个元素的一维数组,而你试图将其转化为一个27行1列的二维数组,由于18不能被27整除,所以无法按照这种形状进行重塑。
具体来说,如果你有如下代码:
```python
arr = np.array([1, 2, 3, ... , 16, 17, 18]) # 假设这是一个长度为18的一维数组
new_shape = (27, 1)
reshaped_arr = arr.reshape(new_shape)
```
会抛出这样的错误,因为`arr.reshape(27, 1)`意味着需要18 * 1 = 18个元素来填充27行1列,但实际上只有18个元素。
解决这个问题的方法通常是调整目标形状,使其能匹配数组的实际大小。如果想要创建一个类似宽度为1的矩阵,可以改为 `(n_rows, 1)` 或者 `(1, n_cols)`,其中 `n_rows * n_cols` 等于数组的总元素数。
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