Derivative of the Huber norm approximation to the ramp function.

1 | ```
hramp.prime(x, lower, eps)
``` |

`x` |
numeric vector. |

`lower` |
left censoring point. |

`eps` |
epsilon value used in |

`hramp`

, `huber`

1 2 | ```
x <- seq(-10, 10, length = 100)
plot(x, hramp.prime(x, lower = 0, eps = 1))
``` |

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