voronoi

x and y coordinates of nodes of the voronoi mosaic. Each node is a
 circumcircle center of some triangle from the Delaunay triangulation.

logical vector, indicating real nodes of the voronoi
 mosaic. These nodes are the centers of circumcircles of triangles with
 positive area of the delaunay triangulation.
If <code>node[i]</code>=<code>FALSE</code>, (<code>c[i]</code>,<code>x[i]</code>) belongs to a
 triangle with area 0.

node

indices of neighbour nodes. Negative indices indicate
 dummy points as neighbours.

n1,n2,n3

triangulation object, see <code><a rd-options="" href="/link/triSht?package=interp&version=1.0-33" data-mini-rdoc="interp::triSht">triSht</a></code>.

area

aspect ratio (inscribed radius/circumradius) of triangle
 \(i\).

ratio

radius

x and y coordinates of dummy points. They are
 used for plotting of unbounded tiles.

dummy.x,dummy.y

A <code>voronoi</code> object is created with <code><a rd-options="" href="/link/voronoi.mosaic?package=interp&version=1.0-33" data-mini-rdoc="interp::voronoi.mosaic">voronoi.mosaic</a></code>

spatial

Bivariate data interpolation on regular and irregular
grids, either linear or using splines are the main part of this
package.  It is intended to provide FOSS replacement functions for
the ACM licensed akima::interp and tripack::tri.mesh functions.
Currently the piecewise linear interpolation part of akima::interp
(and also akima::interpp) is implemented in interp::interp, this
corresponds to the call akima::interp(..., linear=TRUE) which is the
default setting and covers most of akima::interp use cases in
depending packages.  A re-implementation of Akimas spline
interpolation (akima::interp(..., linear=FALSE)) is currently under
development and will complete this package in a later
version. Estimators for partial derivatives are already available,
these are a prerequisite for the spline interpolation.  The basic
part is currently a GPLed triangulation algorithm (sweep hull
algorithm by David Sinclair) providing the starting point for the
piecewise linear interpolator. As side effect this algorithm is also
used to provide replacements for the basic functions of the tripack
package which also suffer from the ACM restrictions.  All functions
are designed to be backward compatible with their akima / tripack
counterparts.

Fortran code by R J Renka R functions by Albrecht Gebhardt  With contributions from Stephen Eglen stephenancedacuk

interp

Interpolation Methods

Albrecht Gebhardt

Roger Bivand

David Sinclair

voronoi function

triangulation object, see <code><a rd-options='' href='triSht'>triSht</a></code>.

A <code>voronoi</code> object is created with <code><a rd-options='' href='voronoi.mosaic'>voronoi.mosaic</a></code>

voronoi: Voronoi object

Description

Arguments

See Also