如何将较小的2D数组添加到较大的数组? [英] How can I add small 2D array to larger array?

问题描述

我有一个较大的2D数组，我想添加一个较小的2D数组.

I have a larger 2D array, and I would like to add a smaller 2D array.

from numpy import *
x = range(25)
x = reshape(x,(5,5))
print x
[[ 0  1  2  3  4]
 [ 5  6  7  8  9]
 [10 11 12 13 14]
 [15 16 17 18 19]
 [20 21 22 23 24]]
y = [66,66,66,66]
y = reshape(y,(2,2))
print y
[[66 66]
 [66 66]]

我想将数组 y 中的值添加到从 1,1 开始的 x 中，以便使 x 看起来像这样:

I would like to add the values from array y to x starting at 1,1 so that x looks like this:

[[ 0  1  2  3  4]
 [ 5 72 73  8  9]
 [10 77 78 13 14]
 [15 16 17 18 19]
 [20 21 22 23 24]]

切片有可能吗?有人可以建议使用slice语句的正确格式来实现这一目标吗?

Is this possible with slicing? Can someone please suggest the correct formatting of the slice statement to achieve this?

谢谢

推荐答案

是的，您可以在numpy数组上使用切片:

Yes, you can use slicing on numpy arrays:

In [20]: x[1:3,1:3] += y

In [21]: print x
[[ 0  1  2  3  4]
 [ 5 72 73  8  9]
 [10 77 78 13 14]
 [15 16 17 18 19]
 [20 21 22 23 24]]

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