The problem with L1-norm is that It may have more than one possible solution. And the test suite should probably take this into account. (And the test suite also needs some fixing.)
PS: It's probably why people usually prefer the L2-norm instead of L1,L3 or LN-norm.
Read a Soroban Abacus
Is my wife right?
Rosenbrock's Banana Function and its derivatives
Use of regexp
Return the first and last character of a string
Least Absolute Deviations (L1-norm) line fit - degree 1
Function minimization - global minimum
Algorithmic Trading - 1 (optimize simple trading strategy)
Algorithmic Trading - 4 (two thresholds)
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