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function [U,V,idx] = spkmeans(X,k,tol,imax)

  [d,n] = size(X);
  
  U = zeros(d,k);
  V = zeros(k,n);
  
  % random clusters and normalize to unit sphere.
  for j = 1:n
    V(randi(k),j) = 1;

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function [U,V,idx] = distkmeans(X,k,tol,imax)

  [d,n] = size(X);
  
  U = zeros(d,k);
  V = zeros(k,n);
  
  % random clusters.
  for j = 1:n
    V(randi(k),j) = 1;

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function [U,V] = exppca(X,k,tol,imax)

  [d,n] = size(X);
  
  % random initialization.
  U = rand(d,k);
  V = rand(k,n);
  I = eye(k);
  
  % for numerical errors.

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% Adapted from the original, available online: 
% http://www.andrewschein.com/software/lpca_code.tar
% 

function [U,V] = logpca(X,k,tol,imax)
  % ensure we have a binary matrix.
  X = spones(X);
  
  [N,D] = size(X);
  U     = rand(N,k);

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function [U,V] = als(X,k,tol,imax,lambda)

  [d,n] = size(X);
  U     = rand(k,d);
  V     = rand(k,n);
  I     = eye(k);

  % convergence monitors.
  olderr = 0;
  

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Discrete mathematics

To really understand data structures and algorithmic complexity, you need to understand discrete math. This the best starting point for CS theory. I love discrete math, others may find it very boring.

• Essentials of Discrete Mathematics (Hunter)

Data structures

I can't think of a good data structures reading off the top of my head unfortunately. Often the trick to an efficient algorithm is really just an efficient data structure. Check out Dijkstra's algorithm for a great example of this (BFS + min-heap/priority queue).

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if has('vim_starting')
  set nocompatible               " Be iMproved

  " Required:
  set runtimepath+=~/.vim/bundle/neobundle.vim/
endif

" Required:
call neobundle#begin(expand('~/.vim/bundle/'))

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###########################
#  Configuration
###########################

# use 256 term for pretty colors
set -g default-terminal "screen-256color"

# default command - use zsh shell
set-option -g default-command "reattach-to-user-namespace -l zsh"

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#user  nobody;
daemon off;
worker_processes  1;

events {
    worker_connections  256;
}

http {
    include       mime.types;

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http://sourceforge.net/projects/cloverefiboot/

To prevent freezing on changing MTU from 0 to 1500 on boot.
http://sourceforge.net/projects/osx86drivers/files/Kext/Snow_or_Above/

Needed drivers/kexts:

1. AptioFix
2. Video resolution fix (cpumem?)
2. Latest Intel driver (E1000e) http://sourceforge.net/projects/osx86drivers/files/Kext/Snow_or_Above/