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How do I convert a numpy array to (and display) an image?
...(and display) an image:
from PIL import Image
import numpy as np
w, h = 512, 512
data = np.zeros((h, w, 3), dtype=np.uint8)
data[0:256, 0:256] = [255, 0, 0] # red patch in upper left
img = Image.fromarray(data, 'RGB')
img.save('my.png')
img.show()
...
Nested JSON objects - do I have to use arrays for everything?
... JSON like this:
{
"stuff": {
"onetype": [
{"id":1,"name":"John Doe"},
{"id":2,"name":"Don Joeh"}
],
"othertype": {"id":2,"company":"ACME"}
},
"otherstuff": {
"thing": [[1,42],[2,2]]
}
}
You can use it like this:
obj.stuf...
C++ preprocessor __VA_ARGS__ number of arguments
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12 Answers
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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，加强局域网的安全性等。它的主要作用有以下几点。
1．共享网络
2．加快访问速度，节约通信带宽
3．防止内部主机受到攻击
4．限制用户访问，完善网络管理
原理：
① 客户端A向代理服务器提出访问Internet的请求。
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Best way to make Java's modulus behave like it should with negative numbers?
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144
It behaves as it should a % b = a - a / b * b; i.e. it's the remainder.
You can do (a % b + b...
Java: parse int value from a char
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edited Apr 30 '18 at 4:24
Neuron
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answ...
How can I declare and define multiple variables in one line using C++?
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10 Answers
10
Active
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The modulo operation on negative numbers in Python
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134
Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as t...
RegEx to parse or validate Base64 data
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148
From the RFC 4648:
Base encoding of data is used in many situations to store or transfer d...
Relative frequencies / proportions with dplyr
...se(n = n()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That mak...