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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...人若想在效率市场持续稳定的赢利，必须成功的解决两大问题：1、如何在高度随机的价格波动中寻找非随机的部分；2、如何有效的控制自身的心理弱点，使之不致影响自己的理性决策。很多投资家的实践都证明，交易系统在上...
Twig: in_array or similar possible within if statement?
...
If you want to achieve the same as in_array() in PHP, ommit the keys filter
– Burgi
Feb 8 '12 at 16:05
25
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How to set selected value of jquery select2?
...
Html:
<select id="lang" >
<option value="php">php</option>
<option value="asp">asp</option>
<option value="java">java</option>
</select>
JavaScript:
$("#lang").select2().select2('val','asp');
jsfiddle
...
Fastest Way to Find Distance Between Two Lat/Long Points
...DIT: Can this be put into one SQL statement?
I have no idea what mySql or Php is capable of, sorry.
I don't know where the best place is to build the four points, or how they could be passed to a mySql query in Php. However, once you have the four points, there's nothing stopping you combining your...
How do I check if a directory exists? “is_dir”, “file_exists” or both?
...hink realpath() may be the best way to validate if a path exist
http://www.php.net/realpath
Here is an example function:
<?php
/**
* Checks if a folder exist and return canonicalized absolute pathname (long version)
* @param string $folder the path being checked.
* @return mixed returns the ...
Nginx reverse proxy causing 504 Gateway Timeout
...se fastcgi_read_timeout and proxy_read_timeout to make sure that nginx and php-fpm did not timeout.
To increase time limit for only one site then you can edit in vim /etc/nginx/sites-available/example.com
location ~ \.php$ {
include /etc/nginx/fastcgi_params;
fastcgi_pass unix:/va...
Event system in Python
... limited interface, but higher performance".
pyeventdispatcher is based on PHP's Symfony framework's event-dispatcher.
dispatcher was extracted from django.dispatch but is getting fairly old.
Cristian Garcia's EventManger is a really short implementation.
Others:
pluggy contains a hook system whic...
蜘蛛的故事 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...下来，问这只蜘蛛：“你我相见总算是有缘，我来问你个问题，看你修炼了这一千多年来，有什么真知拙见。怎么样？”蜘蛛遇见佛主很是高兴，连忙答应了。佛主问到：“世间什么才是最珍贵的？”蜘蛛想了想，回答到：“世...
解决：无法通过windows installer服务安装此安装程序包。您必须安装带有更...
...必须安装带有更新版本windows installer服务的Windows出现这个问题不让安装程序，可...
无法通过windows installer服务安装此安装程序包。您必须安装带有更新版本windows installer服务的Windows。
出现这个问题不让安装程序，可以到微软网...
解决：参数 basepath 不能是相对路径？？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...改动或手动设置参数后项目路径发生了变更都会出现这个问题。项目属性 -> 配置 -> 调试：改成上图（即VS默认配置）即...由于手动将调试参数改动或手动设置参数后项目路径发生了变更都会出现这个问题。
项目属性 -> 配置 ->...