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What is the easiest way to remove the first character from a string?
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234
I kind of favor using something like:
asdf = "[12,23,987,43"
asdf[0] = ''
p asdf
# >>...
What is “entropy and information gain”?
...# ------------------------------------------------
Ashley 1 3 6 f
Brian 0 2 5 m
Caroline 1 4 8 f
David 0 2 5 m
The goal is to build a decision tree. An example of a tree ...
CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
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CMake使用步骤：
运行GUI的cmake界面：
cmake-2.8.1-win32-x86/bin/cmake-gui.exe
执行Configure：
运行之后，生成了如下文件：
生成Makefile：
执行Generate之后生成如下文件：
运行make进行编译：
编译完成后，在build目录生成Tut...
How do I create an average from a Ruby array?
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Joshua Pinter
34k1717 gold badges188188 silver badges208208 bronze badges
answered Aug 27 '09 at 14:00
John Feminel...
pandas dataframe columns scaling with sklearn
...me({'A':[14.00,90.20,90.95,96.27,91.21],
'B':[103.02,107.26,110.35,114.23,114.68],
'C':['big','small','big','small','small']})
>>> dfTest[['A', 'B']] = scaler.fit_transform(dfTest[['A', 'B']])
>>> dfTest
A B ...
How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
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365
DateTime.strptime can handle seconds since epoch. The number must be converted to a string:
r...
How to configure PostgreSQL to accept all incoming connections
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edited Oct 23 '18 at 19:31
Basil Bourque
186k5757 gold badges571571 silver badges804804 bronze badges
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Android phone orientation overview including compass
...nR = new float[16];
float[] I = new float[16];
float[] gravity = new float[3];
float[] geomag = new float[3];
float[] orientVals = new float[3];
double azimuth = 0;
double pitch = 0;
double roll = 0;
public void onSensorChanged(SensorEvent sensorEvent) {
// If the sensor data is unreliable ret...
CentOS+Nginx+PHP+MySQL详细配置(图解) - 更多技术 - 清泛网 - 专注C/C++及内核技术
... //启动MySQL
#/usr/local/mysql/bin/mysqladmin -u root password 123456 //设置MySQL密码
#cp support-files/my-medium.cnf /etc/my.cnf
#echo "/usr/local/mysql/bin/mysqld_safe &" >>/etc/rc.local
二、安装PCRE
PCRE是perl所用到的正则表达式，目的是让所装...