python里有类似MATLAB里find函数的函数吗

Yes, Python has a function similar to the `find` function in MATLAB. In Python, you can use the `numpy.where` function to find the indices of array elements that meet a certain condition.

Here's an example:

import numpy as np

# Create an array of numbers
x = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9])

# Find the indices of elements that are greater than 5
indices = np.where(x > 5)

# Print the indices
print(indices)

The output of this code will be:

(array([5, 6, 7, 8]),)

This means that the elements of `x` at indices 5, 6, 7, and 8 are greater than 5. You can use this function to find the indices of elements that meet any condition you like.

相关问题

怎么用python改写matlab代码ind = find(D > 1/beta);

您可以使用以下代码将MATLAB代码转换为Python：

ind = np.where(D > 1/beta)[0]

注意，您需要导入NumPy库才能使用np.where函数。同时，确保您已将变量D和beta替换为相应的Python变量。

怎么用python改写matlab代码ind = find(D > 1/beta); D = diag(D(ind) - 1/beta);

可以使用numpy库中的函数实现：

import numpy as np

ind = np.where(D > 1/beta)[0]
D = np.diag(D[ind] - 1/beta)