Write a function to implement partial pivoting for Gauss elimination, given the pivot element.
Sorry but I don't understand the test suite.
Replace NaNs with the number that appears to its left in the row.
Number of digits in an integer
Average of square wave
Steepest Descent Method
Augmented Lagrange Multiplier (ALM) Method
Bisection method of finding a root.
Gauss Eliminate 2-by-2 example
Fletcher-Reeves Conjugate Gradient Method
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