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// NOX: An Object-Oriented Nonlinear Solver Package
// Copyright (2002) Sandia Corporation
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#ifndef NOX_RANDOM_H
#define NOX_RANDOM_H
#include "NOX_Common.H"
#include <string>
namespace NOX {
/*!
\brief A class to compute uniformly distributed random numbers in (-1,1).
*/
/*!
The %Random class computes pseudo-random (double precision) numbers
uniformly distributed between -1.0 and 1.0 using a multiplicative
congruential generator with modulus 2^31-1 (a Lehmer generator).
For a numerical and mathematical treatment of the algorithm, see
"Random number generators: good ones are hard to find" by Stephen
K. Park and Keith W. Miller, Communications of the ACM, Vol. 31 No. 10
(1988).
*/
class Random {
public:
//! Initialize random number generator with a random seed.
/*! The random seed is computed using the POSIX rand() function. */
Random();
//! Initialize random number generator with the given seed
/*! The seed should be an integer between 1 and 2147483646 = 2^32-2
(inclusive). If the supplied seed is invalid, an error message
is printed and the seed is replaced by 1.
*/
Random(int s);
//! Set the seed to s
/*! The seed should be an integer between 1 and 2147483646 = 2^32-2
(inclusive). If the supplied seed is invalid, an error message
is printed and the seed is replaced by 1.
*/
static void setSeed(int s);
//! Compute a random number
static double number();
protected:
//! Checks that the supplied seed value is valid and returns a valid seed.
/*! The %string argument supplies the calling function name for an error
message in the case that the supplied seed is invalid.
*/
static int checkSeed(const std::string& func, int s);
protected:
//! Seed value
static double seed;
};
}
#endif
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