python argmin
时间: 2023-09-27 07:07:27 浏览: 57
在 Python 中,`argmin` 是一个用于返回数组或列表中最小元素的索引的函数。你可以使用 NumPy 库的 `argmin` 函数来实现这个功能。以下是一个示例:
```python
import numpy as np
arr = np.array([5, 2, 8, 1, 6])
index = np.argmin(arr)
print(index) # 输出:3
```
在这个例子中,`arr` 是一个包含整数的 NumPy 数组。`np.argmin(arr)` 返回最小元素的索引,这里是 3,因为最小元素是 1。
相关问题
python np.argmin
`np.argmin` is a NumPy function that returns the indices of the minimum values along an axis of an array.
Syntax: `np.argmin(a, axis=None, out=None)`
Parameters:
- `a`: input array
- `axis`: the axis along which to find the minimum value. If not specified, the entire array will be flattened and the index of the minimum value will be returned.
- `out`: optional output array in which to place the result. If provided, the shape must be identical to the output shape.
Returns:
- If `axis` is None, a single integer indicating the index of the minimum value in the flattened array is returned.
- If `axis` is specified, an array of indices is returned, with the same shape as `a` except for the specified axis, which is replaced by a scalar index.
Example:
```python
import numpy as np
arr = np.array([[4, 2, 1],
[3, 5, 6]])
# Returns the index of the minimum value in the flattened array
print(np.argmin(arr)) # Output: 2 (index of value 1)
# Returns the index of the minimum value along axis 0 (column-wise)
print(np.argmin(arr, axis=0)) # Output: [1 0 0] (indices of minimum values in each column)
# Returns the index of the minimum value along axis 1 (row-wise)
print(np.argmin(arr, axis=1)) # Output: [2 0] (indices of minimum values in each row)
```
python中argmin的用法
argmin是一个numpy库中的函数,它用于寻找数组中的最小值,并返回其索引。例如,如果输入数组为[5, 2, 8, 1, 9],则argmin函数将返回3,因为1是数组中的最小值,它的索引为3。argmin函数的用法格式为:numpy.argmin(a, axis=None, out=None)。其中,a是待查找最小值的数组,axis表示沿着哪个轴进行查找,默认为None,表示查找整个数组。out是输出结果的可选数组,用于保存函数结果。
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