在coolshell看到这套麻省理工的CS公开课,讲的非常系统,从简单的问题逐渐深入,个人认为是非常好的一套教程.视频全部都内嵌字幕,质量非常高.
1: Introduction and Goals; Data Types, Operators, and Variables Go to this video
2: Branching, Conditionals, and Iteration Go to this video
3: Common Code Patterns: Iterative Programs Go to this video
4: Abstraction through Functions; Introduction to Recursion Go to this video
5: Floating Point Numbers, Successive Refinement, Finding Roots Go to this video
6: Bisection Methods, Newton/Raphson, Introduction to Lists Go to this video
7: Lists and Mutability, Dictionaries, Introduction to Efficiency Go to this video
8: Complexity: Log, Linear, Quadratic, Exponential Algorithms Go to this video
9: Binary Search, Bubble and Selection Sorts Go to this video
10: Divide and Conquer Methods, Merge Sort, Exceptions Go to this video
11: Testing and Debugging Go to this video
12: Debugging, Knapsack Problem, Introduction to Dynamic Programming Go to this video
13: Dynamic Programming: Overlapping Subproblems, Optimal Substructure Go to this video
14: Introduction to Object-oriented Programming Go to this video
15: Abstract Data Types, Classes and Methods Go to this video
16: Encapsulation, Inheritance, Shadowing Go to this video
17: Computational Models: Random Walk Simulation Go to this video
18: Presenting Simulation Results, Pylab, Plotting Go to this video
19: Biased Random Walks, Distributions Go to this video
20: Monte Carlo Simulations, Estimating pi Go to this video
21: Validating Simulation Results, Curve Fitting, Linear Regression Go to this video
22: Normal, Uniform, and Exponential Distributions Go to this video
23: Stock Market Simulation Go to this video
24: Course Overview; What Do Computer Scientists Do? Go to this video
Fringe从第二季开始转移到温哥华拍摄,其中有许多集都是在UBC取的景.上一次看到拍摄的现场还是上一季观察者用他那把奇怪的枪大开杀戒的那一幕,可惜没有看到几位主角.这次终于让我如愿以偿了! Joshua Jackson, Anna Torv, John Noble, Lance Reddick和Blair Brown都来到了UBC.据我观察,有一幕是:一个人被悬在空中,生死未卜,Peter, Olivia和Walter闻讯来到现场,两个警察用绳子把悬空人从空中拉下来,Walter小跑步上前检查此人,仅此而已.下面是我在现场拍的一些照片
今天研究了一下wordpress在nginx上的rewrite规则,在这里记录一下,也分享给有需要的人
在站点的nginx配置文件中加入如下配置,选择是否要在域名中加入www,两者必须选择一项
# enforce www (exclude certain subdomains)
if ($host !~* ^(www|subdomain))
{
rewrite ^/(.*)$ $scheme://www.$host/$1 permanent;
}
或者
# enforce NO www
if ($host ~* ^www\.(.*))
{
set $host_without_www $1;
rewrite ^/(.*)$ $scheme://$host_without_www/$1 permanent;
}
再加入
# unless the request is for a valid file, send to bootstrap
if (!-e $request_filename)
{
rewrite ^(.+)$ /index.php?q=$1 last;
}
重启nginx即可.在wordpress后台Settings – Permalinks里更改你的设置.
经过两天的研究,在我的linode上安装了nginx, php-fpm和mysql.在这里记录一下整个过程,也给有需要的人分享.
先安装updates
sudo apt-get update
sudo apt-get upgrade --show-upgraded
然后装aptitude
sudo apt-get install aptitude
安装mysql,按照屏幕提示输入root密码
sudo aptitude install mysql-server
接着是nginx
sudo aptitude install python-software-properties
sudo add-apt-repository ppa:nginx/stable
sudo aptitude update
sudo aptitude install nginx
创建/var/www
mkdir /var/www
php-fpm和一些模块
sudo aptitude install php5-cgi php5-mysql php5-fpm php5-curl php5-gd php5-idn php-pear php5-imagick php5-imap php5-mcrypt php5-memcache php5-mhash php5-ming php5-pspell php5-recode php5-snmp php5-sqlite php5-tidy php5-xmlrpc php5-xsl
修改fastcgi_params
sudo vi /etc/nginx/fastcgi_params
加入以下参数
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_script_name;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors on;
附nginx的范例配置文件
最后,重启nginx和php-fpm
sudo /etc/init.d/nginx restart
sudo /etc/init.d/php5-fpm reload