A function with which to generate nonstationary covariance structure.

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`x` |
a sequence of x-values. |

`a` |
The coefficient of slope of the curve. |

`start` |
a starting value for the curve |

`end` |
an ending value for the curve |

`y` |
the function values associated to |

Matt Nunes

`lincurve`

, `simTexture`

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