在numpy数组中的已知索引(x，y)周围切片20×20的区域 [英] Slicing a 20×20 area around known indices (x, y) in a numpy array

问题描述

我有一个大型的2D numpy数组，我知道一对代表该数组一个元素的索引.我想将此元素和周围的20×20区域设置为零；我尝试使用切片技术:

I have a large 2D numpy array for which I know a pair of indices which represent one element of the array. I want to set this element and the surrounding 20×20 area equal to zero; I have attempted using a slicing technique:

s = array[x:10, y:10]
s == 0

但是，尽管先前已经定义了x和y，但这是一个无效的切片".

However, although x and y are previously defined, this is an 'invalid slice'.

对于我是Python的新手，我会提供有关如何完成此操作的任何建议.

I would appreciate any suggestions as to how I can accomplish this as I am new to Python.

推荐答案

my_array[x - 10:x + 10, y - 10:y + 10] = 0

或

s = my_array[x - 10:x + 10, y - 10:y + 10]
s[:] = 0

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