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#include <iostream> |
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#include <math.h> |
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#include "math/randomSPRNG.hpp" |
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#include "utils/simError.h" |
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#include <sprng.h> |
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#ifdef IS_MPI |
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#include <mpi.h> |
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#endif |
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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) |
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newSeed = abs(newSeed); |
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#ifdef IS_MPI |
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//random number generator should not depend on MpiSimulation |
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MPI_Comm_size(MPI_COMM_WORLD, &nSPRNGStreams); |
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myStreamNumber = worldRank; |
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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, newSeed, |
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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() { return sprng(thisStream); } |
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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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} |