product_rule


product_rule, a C code which creates a multidimensional quadrature rule by using a product of distinct one-dimensional quadrature rules.

The program reads a single input file, which contains a list that defines the 1D rules to be used as factors.

Each 1D rule is stored in three files, an "X", "W", and "R" file, which are assumed to share a common filename prefix, so that the files defined by a given prefix have the form:

For instance, let us suppose we want to compute a 2D product rule formed from a 3 point Clenshaw Curtis rule and a 2 point Gauss-Legendre rule. If the prefixes for these files were "cc_d1_o003" and "gl_d1_o002" respectively, then the input file to the program would read as follows:

        cc_d1_o003
        gl_d1_o002
      
When the program read the first 1D rule, it would be searching for three files: and similarly for the second file.

Once the program has computed the multidimensional product rule, it again writes out three files describing the product rule, with a common filename prefix specified by the user, which might be, for instance, product, in which case the files would be:

Usage:

product_rule ( list_file, product_prefix )
where

If the arguments are not supplied on the command line, the program will prompt for them.

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT license

Languages:

product_rule is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version

Related Data and Programs:

CLENSHAW_CURTIS_RULE, a C code which defines a Clenshaw Curtis quadrature rule.

HERMITE_RULE, a C code which can compute and print a Gauss-Hermite quadrature rule.

LEGENDRE_RULE, a C code which computes a 1D Gauss-Legendre quadrature rule.

POWER_RULE, a C code which constructs a power rule, that is, a product quadrature rule from identical 1D factor rules.

product_rule_test

QUADRULE, a C code which defines quadrature rules on a variety of intervals with different weight functions.

TRUNCATED_NORMAL_RULE, a C code which computes a quadrature rule for a normal probability density function (PDF), also called a Gaussian distribution, that has been truncated to [A,+oo), (-oo,B] or [A,B].

Reference:

  1. Philip Davis, Philip Rabinowitz,
    Methods of Numerical Integration,
    Second Edition,
    Dover, 2007,
    ISBN: 0486453391,
    LC: QA299.3.D28.

Source Code:


Last revised on 29 July 2019.