Description Usage Arguments Details Value Author(s) References See Also Examples

Piecewise cubic hermite interpolation.

1 |

`x,y` |
vectors giving the coordinates of the points to be
interpolated. |

`xi` |
points at which to interpolate. |

In contrast to `spline`

, `pchip`

preserves the monotonicity of
`x`

and `y`

.

Normally, the interpolated signal, an array of `length(xi)`

.

if `xi == NULL`

, a list of class `pp`

, a piecewise
polynomial representation with the following elements:

`x` |
breaks between intervals. |

`P` |
a matrix with |

`n` |
number of intervals ( |

`k` |
polynomial order. |

`d` |
number of polynomials. |

Original Octave version by Paul Kienzle pkienzle@user.sf.net. Conversion to R by Tom Short.

Fritsch, F. N. and Carlson, R. E., “Monotone Piecewise Cubic
Interpolation”, *SIAM Journal on Numerical Analysis*, vol. 17, pp. 238-246, 1980.

Octave Forge https://octave.sourceforge.io/

1 2 3 4 5 6 7 |

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