Use forward elimination to make the coefficient matrix, A, an upper triangular matrix, and then solve using back substitution, for a sample 2-by-2 system.
Remove any row in which a NaN appears
Remove the air bubbles
Read a Soroban Abacus
letter yes yes & letter no no
Sequential Unconstrained Minimization (SUMT) using Exterior Penalty
Quasi-Newton Method for Unconstrained Minimization using BFGS Update
False position (linear interpolation) method of finding a root.
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