| 1 |
#include <iostream> |
| 2 |
#include <cmath> |
| 3 |
|
| 4 |
#include "randomSPRNG.hpp" |
| 5 |
#include "simError.h" |
| 6 |
#include "sprng.h" |
| 7 |
|
| 8 |
#ifdef IS_MPI |
| 9 |
#include "mpiSimulation.hpp" |
| 10 |
#endif |
| 11 |
|
| 12 |
using namespace std; |
| 13 |
|
| 14 |
/* randomStreamSPRNF creates a new SPRNG stream for random numbers |
| 15 |
*/ |
| 16 |
|
| 17 |
int randomSPRNG::nStreamsInitialized = 0; |
| 18 |
|
| 19 |
randomSPRNG::randomSPRNG(int iseed){ |
| 20 |
int newSeed; |
| 21 |
nStreamsInitialized++; |
| 22 |
newSeed = abs(iseed) + nStreamsInitialized; |
| 23 |
if( newSeed < 0 ) newSeed = abs( newSeed ); |
| 24 |
|
| 25 |
#ifdef IS_MPI |
| 26 |
|
| 27 |
nSPRNGStreams = mpiSim->getNumberProcessors(); |
| 28 |
|
| 29 |
myStreamNumber = mpiSim->getMyNode(); |
| 30 |
|
| 31 |
|
| 32 |
|
| 33 |
#else |
| 34 |
|
| 35 |
nSPRNGStreams = 1; |
| 36 |
myStreamNumber = 0; |
| 37 |
|
| 38 |
#endif |
| 39 |
|
| 40 |
|
| 41 |
thisStream = init_sprng(GTYPE,myStreamNumber,nSPRNGStreams, |
| 42 |
newSeed,SPRNG_DEFAULT); |
| 43 |
} |
| 44 |
|
| 45 |
randomSPRNG::~randomSPRNG(){ |
| 46 |
if ( thisStream != NULL){ |
| 47 |
free_sprng(thisStream); |
| 48 |
nStreamsInitialized--; |
| 49 |
} |
| 50 |
} |
| 51 |
|
| 52 |
|
| 53 |
double randomSPRNG::getRandom(){ |
| 54 |
return sprng(thisStream); |
| 55 |
} |
| 56 |
|
| 57 |
|
| 58 |
// Gaussian SPRNG class... |
| 59 |
|
| 60 |
double gaussianSPRNG::getGaussian(){ |
| 61 |
double ranNum1; |
| 62 |
double ranNum2; |
| 63 |
double gaussianNumber; |
| 64 |
|
| 65 |
ranNum1 = getRandom(); |
| 66 |
ranNum2 = getRandom(); |
| 67 |
|
| 68 |
gaussianNumber = sqrt(-2.0 * log(ranNum1)) * cos(2 * M_PI * ranNum2); |
| 69 |
|
| 70 |
return gaussianNumber; |
| 71 |
} |
