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How do you detect where two line segments intersect? [closed]
...− q) × r
u = (p − q) × r / (s × r)
To reduce the number of computation steps, it's convenient to rewrite this as follows (remembering that s × r = − r × s):
u = (q − p) × r / (r × s)
Now there are four cases:
If r × s = 0 and (q − p) × r = 0, then the...
How to debug Lock wait timeout exceeded on MySQL?
...e word transaction. It is evident by the statement that the query was attempting to change at least one row in one or more InnoDB tables.
Since you know the query, all the tables being accessed are candidates for being the culprit.
From there, you should be able to run SHOW ENGINE INNODB STATUS\G
Y...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
...转载或使用 隐私策略和使用条款 官方QQ群483928335 #free_v { border:none; position:fixed; top:40%; left:5px; width:200px; height:500px; display: none;}@media screen and (max-width: 700px) { #free_v { top:200%; }}
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ging Extension
03 PSE Page Size Extension
04 TSC Time Stamp Counter
05 MSR Model Specific Registers
06 PAE Physical Address Extension
07 MCE Machine-Check Exception
08 CX8 CMPXCHG8 Instruction
09 APIC On-chip APIC Hardware
10 ...
Creating range in JavaScript - strange syntax
...//true
arr[0]; //'a'
Object.keys(arr); //['0', '1', '2']
arr.length; //3, implies arr[3] === undefined
//we expand the array by 1 item
arr.length = 4;
arr[3]; //undefined
arr.hasOwnProperty(3); //false
Object.keys(arr); //['0', '1', '2']
We get to the inherent difference between the number of ite...
Schema for a multilanguage database
...it + since you are not autogenerating a translationid it may be easier to import items together with their related translations.
The negative side of this is that if you have a complex language fallback mechanism you may need to implement that for each translation table - if you are relying on some ...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...host' identified by 'extmail' with grant option;
flush privileges;
4、QQ邮箱邮件乱码问题：
查看邮件编码，发现这封邮件的编码是：gb18030.手动把编码改成:gb2312邮件就可以正常显示。
关于GB18030 ：由thunderbird或某些客户端软件发出的中文...
List of All Locales and Their Short Codes?
...
The importance of locales is that your environment/os can provide formatting functionality for all installed locales even if you don't know about them when you write your application. My Windows 7 system has 211 locales installed...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...够和我多多地交流。我的MSN是：haoel@hotmail.com（常用），QQ是：753640（不常用）。（注：请勿给我MSN的邮箱发信，由于hotmail的垃圾邮件导致我拒收这个邮箱的所有来信）
我欢迎任何形式的交流，无论是讨论技术还是管理，...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...够和我多多地交流。我的MSN是：haoel@hotmail.com（常用），QQ是：753640（不常用）。（注：请勿给我MSN的邮箱发信，由于hotmail的垃圾邮件导致我拒收这个邮箱的所有来信）
我欢迎任何形式的交流，无论是讨论技术还是管理，...