The Khan Academy is a not-for-profit organization with the mission of providing a high quality education to anyone, anywhere.
We have 1000+ videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance which have been recorded by Salman Khan.

A place for mathematicians to ask and answer questions

I have written software professionally in perhaps a dozen programming languages, and the hardest language for me to learn has been R. The language is actually fairly simple, but it is unconventional. These notes are intended to make the language easier to learn for someone used to more commonly used languages such as C++, Java, Perl, etc.

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A scientific poster is a large document that can communicate your research at a scientific meeting, and is composed of a short title, an introduction to your burning question, an overview of your trendy experimental approach, your amazing results, some insightful discussion of aforementioned results, a listing of previously published articles that are important to your research, and some brief acknowledgement of the tremendous assistance and financial support conned from others—if all text is kept to a minimum, a person could fully read your poster in under 10 minutes.

Nmap Network Scanning is the official guide to the Nmap Security Scanner, a free and open source utility used by millions of people for network discovery, administration, and security auditing. From explaining port scanning basics for novices to detailing low-level packet crafting methods used by advanced hackers, this book by Nmap's original author suits all levels of security and networking professionals. The reference guide documents every Nmap feature and option, while the remainder demonstrates how to apply them to quickly solve real-world tasks. Examples and diagrams show actual communication on the wire. Topics include subverting firewalls and intrusion detection systems, optimizing Nmap performance, and automating common networking tasks with the Nmap Scripting Engine.

Came for the splashpage, stayed for the good times.

Because I can't motivate myself to learn it.

This is a brief introduction to Python for Lisp programmers. (Although it wasn't my intent, Python programers have told me this page has helped them learn Lisp.) Basically, Python can be seen as a dialect of Lisp with "traditional" syntax (what Lisp people call "infix" or "m-lisp" syntax). One message on comp.lang.python said "I never understood why LISP was a good idea until I started playing with python." Python supports all of Lisp's essential features except macros, and you don't miss macros all that much because it does have eval, and operator overloading, and regular expression parsing, so you can create custom languages that way.

Some of these supplemental notes are good, others only rough drafts or half-completed. Because they are designed only to provide additional examples, summaries, or explanations where the textbook is weak, they do not cover many obviously important topics. You can download a zipped version: notes-cpp-2004-12-19.zip [less than 400 KB]. -- Fred

How to install magic the gathering in vista/xp (or anything else... seems complicated)

Intro to git. I'm gettign skiddish about modifying my little partner parser.

The perfect IMAP/Gmail setup.

SciPy (pronounced "Sigh Pie") is open-source software for mathematics, science, and engineering. It is also the name of a very popular conference on scientific programming with Python.

Union College Dept. Of Math tutorial of R.