triangle_integrals

triangle_integrals, an Octave code which returns the exact value of the integral of a polynomial over the interior of an arbitrary triangle in 2D.

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

triangle_integrals is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

triangle_integrals_test

octave_integrals, an Octave code which returns the exact value of the integral of any monomial over the surface or interior of some geometric object, including a line, quadrilateral, box, circle, disk, sphere, ball and others.

Source Code:

• i4_to_pascal.m, converts an I4 to a pair of indices in Pascal's triangle;
• i4_to_pascal_degree.m, converts an I4 to the degree (sum) of the corresponding pair of indices in Pascal's triangle;
• pascal_to_i4.m, converts a pair of indices in Pascal's triangle to a linear index;
• poly_power_linear.m, computes a power of a linear polynomial in X and Y.
• poly_power.m, computes a power of a polynomial in X and Y.
• poly_print.m, prints a polynomial in X and Y.
• poly_product.m, computes the product of two polynomials in X and Y.
• r8mat_print.m, prints an R8MAT;
• r8mat_print_some.m, prints some of an R8MAT;
• rs_to_xy_map.m, determines the map coefficients from the reference to physical triangle.
• triangle01_monomial_integral.m computes the integral of a monomial over the reference triangle.
• triangle01_poly_integral.m computes the integral of a polynomial over the reference triangle.
• triangle_area.m computes the area of a arbitary triangle.
• triangle_monomial_integral.m computes the integral of a monomial over an arbitrary triangle.
• triangle_poly_integral.m computes the integral of a polynomial over an arbitrary triangle.
• triangle_xy_integral.m computes the integral of xy over an arbitrary triangle.
• trinomial.m, computes a trinomial coefficient;
• xy_to_rs_map.m, determines the map coefficients from the physical to reference triangle.