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Shortest distance between a point and a line segment
...len_sq != 0) //in case of 0 length line
param = dot / len_sq;
var xx, yy;
if (param < 0) {
xx = x1;
yy = y1;
}
else if (param > 1) {
xx = x2;
yy = y2;
}
else {
xx = x1 + param * C;
yy = y1 + param * D;
}
var dx = x - xx;
var dy = y - yy;
ret...
ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...容摘要：1）安装zeromq、2）实例说明使用zmq进行网络间的消息发送和接收首先在机器中安装zmq库步骤如下：1）下载zeromq的源代码，Zer...本文内容摘要：1）安装zeromq、2）实例说明使用zmq进行网络间的消息发送和接收
首先在机器...
马云、王健林为什么都看中了上海？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...什么都看中了上海？前阵子支付宝和万达总部落户上海的消息占领了各大媒体的版面，这看起来似乎只是个集体搬家的巧合，但事实上，近几年各大中外企业将总部迁至
前阵子支付宝和万达总部落户上海的消息占领了各大...
Split (explode) pandas dataframe string entry to separate rows
...column:
In [46]: df
Out[46]:
var1 var2 var3
0 a,b,c 1 XX
1 d,e,f,x,y 2 ZZ
In [47]: explode(df.assign(var1=df.var1.str.split(',')), 'var1')
Out[47]:
var1 var2 var3
0 a 1 XX
1 b 1 XX
2 c 1 XX
3 d 2 ZZ
4 e 2 ZZ
5 f 2 ...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...ke conditions: 3
Internal state:
interface tiwlan0 runState=Running
SSID: XXXXXXX BSSID: xx:xx:xx:xx:xx:xx, MAC: xx:xx:xx:xx:xx:xx, Supplicant state: COMPLETED, RSSI: -60, Link speed: 54, Net ID: 2, security: 0, idStr: null
ipaddr 192.168.1.xxx gateway 192.168.x.x netmask 255.255.255.0 dns1 192.168...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，其运行流程则如下所示：
有些细心的读者会问：在消息传递的过程中，用户所在的User IP已经不在消息中存在了，那负载平衡服务器在传回响应的时候应该如何恢复用户的IP地址呢？实际上在这种转发方式中，负载平衡服务...
MFC中ComboBox控件的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...,Cut,Paste动可以使用。
最后介绍一下列表框几种常用的消息映射宏：
ON_CBN_DBLCLK鼠标双击
ON_CBN_DROPDOWN列表框被弹出
ON_CBN_KILLFOCUS/ ON_CBN_SETFOCUS 在输入框失去/得到输入焦点时产生
ON_CBN_SELCHANGE列表框中选择的行发生改变
ON_CBN_...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...
You should use 400 for business rules. Don't return 2xx if the order was not accepted. HTTP is an application protocol, never forget that. If you return 2xx the client can assume the order was accepted, regardless of any information you send in the body.
From RESTful Web Servi...
Requests — how to tell if you're getting a 404
...us_code
404
If you want requests to raise an exception for error codes (4xx or 5xx), call r.raise_for_status():
>>> r = requests.get('http://httpbin.org/status/404')
>>> r.raise_for_status()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
F...
Android Studio - How to increase Allocated Heap Size
...p/Contents/bin/studio.vmoptions
Change the content to
-Xms128m
-Xmx4096m
-XX:MaxPermSize=1024m
-XX:ReservedCodeCacheSize=200m
-XX:+UseCompressedOops
Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool. Your JVM w...