ASA172
Generation of all multi-indices in a given range


ASA172 is a FORTRAN77 library which generates all multidimensional indices in a given range. simulating the behavior of an arbitrary number of nested loops, by OFlaherty and MacKenzie.

If the number of dimensions was known in advance, such an operation could be carried out by the corresponding set of nested loops. For example, in 3D:

        do i = i1, i2
          do j = j1, j2
            do k = k1, k2
              (I,J,K) is an index in the range.
            end do
          end do
        end do
      
One feature of this library, though, is that it can generate all such indexes for an arbitrary number of dimensions.

ASA172 is Applied Statistics Algorithm 172. Source code for many Applied Statistics Algorithms is available through STATLIB.

Languages:

ASA172 is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

SUBSET, a FORTRAN77 library which enumerates combinations, partitions, subsets, index sets, trees, and other combinatorial objects.

Author:

Original FORTRAN77 version by M OFlaherty, G MacKenzie; This FORTRAN77 version by John Burkardt.

Reference:

  1. M OFlaherty, G MacKenzie,
    Algorithm AS 172: Direct Simulation of Nested Fortran DO-LOOPS,
    Applied Statistics,
    Volume 31, Number 1, 1982, pages 71-74.

Source Code:

Examples and Tests:

List of Routines:

You can go up one level to the FORTRAN77 source codes.


Last revised on 26 July 2008.