Derivative of the Huber norm approximation to the tilted absolute value function.
tilted.huber.prime(x, tau, eps)
epsilon value used in huber and related functions.
tilted.huber, huber, tilted.abs
x <- seq(-10, 10, length = 100)
plot(x, tilted.huber.prime(x, tau = 0.75, eps = 1))
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