pyramid_rule, an Octave code which generates a quadrature rule over the interior of the unit pyramid in 3D.
The quadrature rules generated by PYRAMID_RULE are all examples of conical product rules, and involve a kind of direct product of the form:
Legendre rule in X * Legendre rule in Y * Jacobi rule in Zwhere the Jacobi rule includes a factor of (1-Z)^2.
The integration region is:
- ( 1 - Z ) <= X <= 1 - Z - ( 1 - Z ) <= Y <= 1 - Z 0 <= Z <= 1.When Z is zero, the integration region is a square lying in the (X,Y) plane, centered at (0,0,0) with "radius" 1. As Z increases to 1, the radius of the square diminishes, and when Z reaches 1, the square has contracted to the single point (0,0,1).
pyramid_rule ( legendre_order, jacobi_order, 'filename' )where
The computer code and data files described and made available on this web page are distributed under the MIT license
pyramid_rule is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version.
alpert_rule, an Octave code which sets up an Alpert quadrature rule for functions which are regular, log(x) singular, or 1/sqrt(x) singular.
annulus_rule, an Octave code which computes a quadrature rule for estimating integrals of a function over the interior of a circular annulus in 2d.
circle_rule, an Octave code which computes a quadrature rule over the circumference of the unit circle in 2d.
cube_felippa_rule, an Octave code which returns the points and weights of a felippa quadrature rule over the interior of a cube in 3d.
disk_rule, an Octave code which computes quadrature rules over the interior of a disk in 2d.
jacobi_rule, an Octave code which can compute and print a gauss-jacobi quadrature rule.
legendre_rule, an Octave code which can compute and print a gauss-legendre quadrature rule.
pyramid_exactness, an Octave code which investigates the polynomial exactness of a quadrature rule over the interior of the unit pyramid in 3d.
pyramid_felippa_rule, an Octave code which returns felippa's quadratures rules for approximating integrals over the interior of a pyramid in 3d.
pyramid_grid, an Octave code which computes a grid of points over the interior of the unit pyramid in 3d;
pyramid_integrals, an Octave code which returns the exact value of the integral of any monomial over the interior of the unit pyramid in 3d.
pyramid_monte_carlo, an Octave code which applies a monte carlo method to estimate integrals of a function over the interior of the unit pyramid in 3d;
quadrature_rules_pyramid, a dataset directory which contains quadrature rules over the interior of the unit pyramid in 3d.
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stroud, an Octave code which defines quadrature rules for a variety of unusual areas, surfaces and volumes in 2d, 3d and n-dimensions.
tetrahedron_felippa_rule, an Octave code which returns felippa's quadratures rules for approximating integrals over the interior of a tetrahedron in 3d.
triangle_fekete_rule, an Octave code which defines fekete rules for quadrature or interpolation over the interior of a triangle in 2d.
triangle_felippa_rule, an Octave code which returns felippa's quadratures rules for approximating integrals over the interior of a triangle in 2d.
wedge_felippa_rule, an Octave code which returns quadratures rules for approximating integrals over the interior of the unit wedge in 3d.