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Pandas DataFrame Groupby two columns and get counts
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126
Followed by @Andy's answer, you can do following to solve your second question:
In [56]: df.g...
How to set a single, main title above all the subplots with Pyplot?
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291
Use pyplot.suptitle or Figure.suptitle:
import matplotlib.pyplot as plt
import numpy as np
fig...
Is there an MD5 Fixed Point where md5(x) == x?
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138
Since an MD5 sum is 128 bits long, any fixed point would necessarily also have to be 128 bits ...
Breaking loop when “warnings()” appear in R
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152
You can turn warnings into errors with:
options(warn=2)
Unlike warnings, errors will interr...
libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...这里，方便给同样刚入门的朋友指引。
一.下载安装
1.到http://curl.haxx.se/download.html上下载最新版本，由于公司的机器安装rpm有依赖关系，所以直接下载了source
2.编译。解压后进入curl的目录，直接执行 make all 就行。
3....
Gradient of n colors ranging from color 1 and color 2
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181
colorRampPalette could be your friend here:
colfunc <- colorRampPalette(c("black", "white"...
std::vector performance regression when enabling C++11
...nteresting performance regression in a small C++ snippet, when I enable C++11:
1 Answer
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Android Layout with ListView and Buttons
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137
I think this is what you are looking for.
<?xml version="1.0" encoding="utf-8"?>
<Re...
Count(*) vs Count(1) - SQL Server
Just wondering if any of you people use Count(1) over Count(*) and if there is a noticeable difference in performance or if this is just a legacy habit that has been brought forward from days gone past?
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Efficiency of Java “Double Brace Initialization”?
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