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54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// $Id: getRandomWeights.cpp 962 2006-11-07 15:13:34Z privmane $
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#include "getRandomWeights.h"
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#include "talRandom.h"
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void swapRand(Vdouble& weights) {
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int j;
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int i = talRandom::giveIntRandomNumberBetweenZeroAndEntry(weights.size());
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do {
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j = talRandom::giveIntRandomNumberBetweenZeroAndEntry(weights.size());
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} while ( weights[j] <= 0 );
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weights[i]++;
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weights[j]--;
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}
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void getRandomWeights::randomWeights(Vdouble& weights,
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const MDOUBLE expectedNumberOfSwapsPerPosition) {
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// note that some positions will change more than once, and some won't.
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// thus the second argument is an average of sites swaped
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int i;
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const double DefaultWeight = 1;
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for (i=0; i< weights.size(); ++i) weights[i] = DefaultWeight;
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for ( i = 0 ; i < expectedNumberOfSwapsPerPosition*weights.size() ; ++i ) {
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swapRand(weights);
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}
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}
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void getRandomWeights::standardBPWeights(Vdouble& weights) {
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int i;
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for (i=0; i< weights.size(); ++i) weights[i] = 0.0;
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for (i=0; i< weights.size(); ++i) {
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int k = talRandom::giveIntRandomNumberBetweenZeroAndEntry(weights.size());
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weights[k]++;
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}
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}
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#define MIN_WEIGHT (0.00001)
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void getRandomWeights::randomWeightsGamma(Vdouble& weights,
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const MDOUBLE temperature) {
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int i;
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const double oneOverT = 1.0/temperature;
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for (i=0; i< weights.size(); ++i) {
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weights[i] = talRandom::SampleGamma(oneOverT,oneOverT);
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if (weights[i]<MIN_WEIGHT) {
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weights[i] = MIN_WEIGHT;
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}
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}
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}
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