I've implemented the Welzl's algorithm, but, please, be warned as I've learned later that sometimes the algorithm fails. Years later, Matoušek, Sharir, and Welzl seems to have fixed the problem, creating a new version of the algorithm (adding one additional test).
swap sign sum & multiply castles
Vectorizing, too easy or too hard?
Create One Large Eye of size N x N Quickly?
The Birthday Phenomenon
Number of bytes required to store a sparse matrix
Function minimization - global minimum
Algorithmic Trading - 2 (optimize Calmar Ratio)
Function minimization - beat fminbnd!
Least Absolute Deviations (L1-norm) line fit - degree 1
Algorithmic Trading - 4 (two thresholds)
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