# randlc

randlc, a C code which implements a version of the random number generator (RNG) used by the NAS Parallel Benchmarks.

The generator has the form

X(K+1) = A * X(K) mod 2^46

where the suggested value 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 https://www.nas.nasa.gov/Resources/Software/npb.html.

### Languages:

randlc is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

### Related Data and Programs:

ASA183, a C code which implements the Wichman-Hill pseudorandom number generator.

c_random_test, C codes which illustrate the use of C's random number generator routines.

NORMAL, a C code which computes a sequence of pseudorandom normally distributed values.

RANLIB, a C code which produces random samples from Probability Density Functions (PDF's), including Beta, Chi-square Exponential, F, Gamma, Multivariate normal, Noncentral chi-square, Noncentral F, Univariate normal, random permutations, Real uniform, Binomial, Negative Binomial, Multinomial, Poisson and Integer uniform, by Barry Brown and James Lovato.

RANDOM_SORTED, a C code which generates vectors of random values which are already sorted.

RNGLIB, a C code which implements a random number generator (RNG) with splitting facilities, allowing multiple independent streams to be computed, by L'Ecuyer and Cote.

UNIFORM, a C code which computes elements of a pseudorandom sequence.

VAN_DER_CORPUT, a C code which computes elements of a 1D van der Corput Quasi Monte Carlo (QMC) sequence using a simple interface.

### Reference:

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,