User:Orderud

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1 Fredrik Orderud
2 Wikipedia growth script
3 Category contributions
4 Wikipedia contributions
5 Interesting articles

[edit] Fredrik Orderud

Ph.D. student in computer science at NTNU. My primary focus on Wikipedia is adding technical content.

Wikibooks has a book on the topic of

User:Orderud

Writing resources:

m:Help:Formula - LaTeX math reference.
b:LaTeX - LaTeX tutorial.

[edit] Wikipedia growth script

% Matlab script for plotting Wikipedia growth
% Data source: http://en.wikipedia.org/wiki/Wikipedia:Size_of_Wikipedia

data = importdata('wikipedia_size.txt', ' ', 0);
t = datenum(data.textdata','yyyy-mm-dd');
t = t - min(t);    % start counting days at zero
t = 2001 + t./365; % first sample was taken in jan 2001

% regression plot corresponding to 100% increase every year
semilogy(t(1:160), 2.5e4*2.^(t(1:160)-2001), 'r'); hold on

% plot actual size statistics
semilogy(t, data.data);

title 'Wikipedia growth (english ed.)';
xlabel 'Year'
ylabel 'Article count'
legend('100% yearly increase line', ...
       'Actual article count');
hold off;

[edit] Category contributions

[edit] Wikipedia contributions

[edit] Estimation theory

Written sections regarding stability, controllability and observability, transfer function and canonical realizations in state space (controls).
Written sections regarding system description, error metric, Kalman filter equations for both the regular and extended Kalman filter, as well as derivation in Kalman filter.
Section regarding properties of Gauss-Markov process.
Articles on proper and strictly proper transfer functions.
Section regarding state space stability in Lyapunov stability.
Created article/stub on discretization.
Rewritten model and estimation formulas for linear prediction.
Created minimum mean-square error (MMSE) stub.
Created the Recursive Bayesian estimation article

[edit] Computer vision

Image moments
Section on Methods for determining optical flow in optical flow.
Written article on phase correlation in computer vision.
Created stub article on the condensation algorithm for realtime visual tracking.
Started list of computer vision conferences

[edit] Computer graphics

Shadow volume restructuring, and technical content
Described the three main algorithms used for stencil shadow volume
Algorithm to compute silhouette edges of 3D objects
Collision detection section on mathematical foundation
Stencil buffer stub
Catmull-Clark subdivision surface
B-spline blending matrices

[edit] Signal processing

Total rewrite of Pulse-doppler radar to present the underlying principles, formulas, as well as clearifying that it is NOT based on the doppler effect.
Wrote autocorrelation technique article, which is used to estimate the dominating frequency in a signal.

[edit] Numerical computing

Matrix inversion, analytic formulas for 2x2, 3x3 and blockwise inversion
Written article about Conversion between Quaternions and Euler angles
Added Basic Linear Algebra Subprograms section about functionality
Created Power method stub
Standard and augmented forms in linear programming
Simplex algorithm (in progress)
Wrote the Matrix calculus article.
Rejection sampling

[edit] Computer software

Added section on (the lack of) encryption in Apple Remote Desktop.
Features of the Remote Desktop Protocol.
Discussed file locking in UNIX and Windows.
Created a circular dependency article, which adresses how C++ implements circular dependencies.
Created the Microsoft Dynamic Link Library (DLL) article, with programming examples.
Provided sections on linear algebra, and random number generation in the Boost library.