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Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...化插件）
是否涉及动态资源
是否有申请动态内存，文件描述符等，执行完是否有正确释放？指针等操作是否规范？
性能如何
是否有一些执行耗时的操作，I/O，网络文件下载，文件解析等，是否可以进行优化？是否会...
Convert Unix timestamp into human readable date using MySQL
... no TO_UNIXTIME, but instead UNIX_TIMESTAMP.
– Olle Härstedt
May 22 at 12:45
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Getting the count of unique values in a column in bash
...1
w 1
column 1:
d 3
r 2
b 1
g 1
m 1
z 1
column 2:
c 4
a 3
e 2
.csv input
If your input files are .csv, change /\s+/ to /,/
Obfuscation
In an ugly contest, Perl is particularly well equipped.
This one-liner does the same:
perl -lane 'for $i (0..$#F){$g[$i]{$F[$i]}++};END{for $j (0..$#...
How to redirect output with subprocess in Python?
...mmand line directly from python.
import subprocess32 as sub
with open("A.csv","a") as f:
f.flush()
sub.Popen(["cat","temp.csv"],stdout=f)
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HTML5 Canvas vs. SVG vs. div
What is the best approach for creating elements on the fly and being able to move them around? For example, let's say I want to create a rectangle, circle and polygon and then select those objects and move them around.
...
adding noise to a signal in python
...,2)
# in your case you need to replace this with
# clean_signal = pd.read_csv("your_data.csv")
clean_signal = pd.DataFrame([[1,2],[3,4]], columns=list('AB'), dtype=float)
print(clean_signal)
"""
print output:
A B
0 1.0 2.0
1 3.0 4.0
"""
import numpy as np
mu, sigma = 0, 0.1
# crea...
How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII
...ipedia articles, the most common non-ASCII characters are ·•–é°®’èö—. Based on this fact,
The bytes 0x92, 0x95, 0x96, 0x97, 0xAE, 0xB0, 0xB7, 0xE8, 0xE9, or 0xF6 suggest windows-1252.
The bytes 0x8E, 0x8F, 0x9A, 0xA1, 0xA5, 0xA8, 0xD0, 0xD1, 0xD5, or 0xE1 suggest MacRoman.
Count u...
【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...。模板让你在构建应用程序时有一个好的开始。找到本课文件夹中提供的文件(moodtracker_temp .aia)（可在附件中下载）。把文件下载到你电脑的硬盘上。注意保存文件的位置。进入App Inventor (http://ai2.appinventor.mit.edu)，从计算机中导...
A simple explanation of Naive Bayes Classification
...exactly answers that question.
Just create a file called named new_dataset.csv and paste the following content.
Age,Income,Student,Creadit_Rating,Buys_Computer
<=30,high,no,fair,no
<=30,high,no,excellent,no
31-40,high,no,fair,yes
>40,medium,no,fair,yes
>40,low,yes,fair,yes
>40,low,yes...
Pseudo-terminal will not be allocated because stdin is not a terminal
...ize the content of $1 at all.
– Cristian Matthias Ambæk
Aug 26 '16 at 9:33
1
@mklement0 Sure, yo...