michiexile/icerm-tda-2019-08

Lp gradient

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Found at Stackexchange:
https://math.stackexchange.com/questions/1482494/derivative-of-the-l-p-norm/1482525

d/dxk ||x||_p = [x_k |x_k| ^ (p-2)] / [ ||x||_p ^ (p-1) ]