Return the order of a spline object.

1 | ```
splineOrder(object)
``` |

`object` |
An object that inherits from class |

The order of a spline is the number of coefficients in each piece of the piecewise polynomial representation. Thus a cubic spline has order 4.

A positive integer.

Douglas Bates and Bill Venables

`splineKnots`

,
`interpSpline`

,
`periodicSpline`

1 | ```
splineOrder( interpSpline( weight ~ height, women ) )
``` |

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