randlc, an Octave code which implements a version of the pseudorandom number generator used by the NAS Parallel Benchmarks.

The generator has the form

        X(K+1) = A * X(K) mod 2^46
where the suggested valule of the multiplier A is 5^13 = 1220703125.

This scheme generates 2^44 numbers before repeating.

The web site for the NAS Parallel Benchmarks is http://www.nas.nasa.gov/Resources/Software/npb.html.


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


randlc 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:



  1. David Bailey, Eric Barszcz, John Barton, D Browning, Robert Carter, Leonardo Dagum, Rod Fatoohi, Samuel Fineberg, Paul Frederickson, Thomas Lasinski, Robert Schreiber, Horst Simon, V Venkatakrishnan, Sisira Weeratunga,
    The NAS Parallel Benchmarks,
    RNR Technical Report RNR-94-007, March 1994.
  2. Donald Knuth,
    The Art of Computer Programming, Volume 2, Seminumerical Algorithms,
    Third Edition,
    Addison Wesley, 1997,
    ISBN: 0201896842,
    LC: QA76.6.K64.

Source Code:

Last revised on 17 September 2022.