Saturday, June 25, 2011
Friday, June 24, 2011
Thursday, June 23, 2011
The Barnes-Hut Algorithm
The Barnes-Hut Algorithm: "The crucial idea in speeding up the brute force n-body algorithm is to group nearby bodies and approximate them as a single body. If the group is sufficiently far away, we can approximate its gravitational effects by using its center of mass. The center of mass of a group of bodies is the average position of a body in that group, weighted by mass. Formally, if two bodies have positions (x1, y1) and (x2, y2), and masses m1 and m2, then their total mass and center of mass (x, y) are given by:"
c++ - Local variable's memory can be accessed outside its scope?! - Stack Overflow
c++ - Local variable's memory can be accessed outside its scope?! - Stack Overflow: "How can it be? Isn't the memory of a local variable inaccessible outside its function?
You rent a hotel room. You put a book in the top drawer of the bedside table and go to sleep. You check out the next morning, but 'forget' to give back your key. You steal the key!
A week later, you return to the hotel, do not check in, sneak into your old room with your stolen key, and look in the drawer. Your book is still there. Astonishing!
How can that be? Isn't the contents of a hotel room drawer inaccessible if you haven't rented the room?"
You rent a hotel room. You put a book in the top drawer of the bedside table and go to sleep. You check out the next morning, but 'forget' to give back your key. You steal the key!
A week later, you return to the hotel, do not check in, sneak into your old room with your stolen key, and look in the drawer. Your book is still there. Astonishing!
How can that be? Isn't the contents of a hotel room drawer inaccessible if you haven't rented the room?"
YouTube - Britney Spears - I Wanna Go
YouTube - Britney Spears - I Wanna Go: "http://youtu.be/T-sxSd1uwoU"
Wednesday, June 22, 2011
Self-Organizing Music Tag Clouds, Geo-Shuffling, and Robotic Musicianship : George Tzanetakis : Free Download & Streaming : Internet Archive
Self-Organizing Music Tag Clouds, Geo-Shuffling, and Robotic Musicianship : George Tzanetakis : Free Download & Streaming : Internet Archive
A talk by my supervisor at UVIC, Dr. George Tzanetakis, that he recently gave at Facebook. Very cool.
A talk by my supervisor at UVIC, Dr. George Tzanetakis, that he recently gave at Facebook. Very cool.
Monday, June 20, 2011
Learn Emacs: align-regexp - Raw Syntax
Learn Emacs: align-regexp - Raw Syntax: "# before align-regexp, not super easy to read
var = 5
another_value = 10
assignment = 5
very_long_var_name = 25
# after align-regexp =, readability improved!
var = 5
another_value = 10
assignment = 5
very_long_var_name = 25"
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