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mmeineke |
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#include <iostream> |
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#include <cmath> |
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#include "randomSPRNG.hpp" |
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#include "simError.h" |
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#include <sprng.h> |
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#ifdef IS_MPI |
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#include "mpiSimulation.hpp" |
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#endif |
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using namespace std; |
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/* randomStreamSPRNF creates a new SPRNG stream for random numbers |
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*/ |
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int randomSPRNG::nStreamsInitialized = 0; |
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randomSPRNG::randomSPRNG(int iseed){ |
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int newSeed; |
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nStreamsInitialized++; |
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newSeed = abs(iseed) + nStreamsInitialized; |
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if( newSeed < 0 ) newSeed = abs( newSeed ); |
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#ifdef IS_MPI |
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nSPRNGStreams = mpiSim->getNumberProcessors(); |
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myStreamNumber = mpiSim->getMyNode(); |
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#else |
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nSPRNGStreams = 1; |
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myStreamNumber = 0; |
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#endif |
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thisStream = init_sprng(GTYPE,myStreamNumber,nSPRNGStreams, |
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newSeed,SPRNG_DEFAULT); |
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} |
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randomSPRNG::~randomSPRNG(){ |
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if ( thisStream != NULL){ |
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free_sprng(thisStream); |
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nStreamsInitialized--; |
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} |
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} |
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double randomSPRNG::getRandom(){ |
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return sprng(thisStream); |
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} |
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// Gaussian SPRNG class... |
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double gaussianSPRNG::getGaussian(){ |
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double ranNum1; |
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double ranNum2; |
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double gaussianNumber; |
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ranNum1 = getRandom(); |
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ranNum2 = getRandom(); |
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gaussianNumber = sqrt(-2.0 * log(ranNum1)) * cos(2 * M_PI * ranNum2); |
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return gaussianNumber; |
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} |
