lattice_rule, a FORTRAN90 code which approximates integrals in multiple dimensions using lattice rules.
The lattice rules are defined on the unit square, or in higher dimensions, on the unit hypercube.
Lattice rules are more suitable to integrands that are periodic, with period 1, in all variables. However, there are techniques that may be used when the integrand does not satisfy this requirement.
The performance of a lattice rule depends heavily on the choice of the generator vectors. Once the spatial dimension and the number of points have been chosen, there are techniques for finding a good generator vector.
The simplest lattice rules are called "rank 1" rules, and use a lattice generated by multiples of a single generator vector. More elaborate rules can be generated by using more generator vectors, up to the maximum, which is the dimension of the space.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
lattice_rule is available in a C++ version and a FORTRAN90 version and a MATLAB version.
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