extprod3d

<code>n</code>-by-3 matrix. Each row is one x-vector

<code>n</code>-by-3 matrix. Each row is one y-vector

logical. If <code>TRUE</code> and if the inputs are one row
matrices or vectors, then delete the dimensions of the array
returned.

drop

Computes the external product $$ $$$$ \left(x_2 y_3 - x_3 y_2,\; x_3 y_1 - x_1
y_3,\; x_1 y_2 - x_2 y_1 \right) $$$$ $$ of the 3D vectors in x and y.

arith

math

array

Makes the 'Qhull' library <http://www.qhull.org>
available in R, in a similar manner as in Octave and MATLAB. Qhull
computes convex hulls, Delaunay triangulations, halfspace
intersections about a point, Voronoi diagrams, furthest-site
Delaunay triangulations, and furthest-site Voronoi diagrams. It
runs in 2D, 3D, 4D, and higher dimensions. It implements the
Quickhull algorithm for computing the convex hull. Qhull does not
support constrained Delaunay triangulations, or mesh generation of
non-convex objects, but the package does include some R functions
that allow for this.

David Sterratt

geometry

extprod3d: Compute external- or `cross'- product of 3D vectors.

Description

Usage

Arguments

Value

See Also