# An S curve function between two constant values.

### Description

A function with which to generate nonstationary covariance structure.

### Usage

1 |

### Arguments

`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 |

### Value

`y` |
the function values associated to |

### Author(s)

Matt Nunes

### See Also

`lincurve`

, `simTexture`

### Examples

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