public double proposeNewValueInLogSpace(
QuietRealParameter proposal,
double oldValue,
ParametricDistribution distr,
double upper,
double lower)
throws Exception {
double sampleVal = distr.sample(1)[0][0];
double newValue = Math.exp(sampleVal + Math.log(oldValue));
proposal.setValueQuietly(0, newValue);
proposal.setBounds(lower, upper);
return distr.calcLogP(new QuietRealParameter(new Double[] {sampleVal})) - Math.log(newValue);
}
public double mergeValueInLogSpace(
RealParameter removed, RealParameter merge, ParametricDistribution distr) throws Exception {
double val1 = Math.log(removed.getValue());
double val2 = Math.log(merge.getValue());
double x = val1 - val2;
return distr.calcLogP(new RealParameter(new Double[] {x})) - val1;
}
public double mergeValue(RealParameter removed, RealParameter merge, ParametricDistribution distr)
throws Exception {
Double[] x = new Double[removed.getDimension()];
for (int i = 0; i < x.length; i++) {
x[i] = removed.getValue(i) - merge.getValue(i);
}
return distr.calcLogP(new RealParameter(x));
}
private double proposeNewValue(
QuietRealParameter proposal,
Double[] oldValues,
ParametricDistribution distr,
double upper,
double lower)
throws Exception {
Double[] sampleVals = distr.sample(1)[0];
for (int i = 0; i < sampleVals.length; i++) {
// if(distr instanceof DiracDeltaDistribution)
// System.out.println(distr.getClass());
proposal.setValueQuietly(i, oldValues[i] + sampleVals[i]);
}
proposal.setUpper(upper);
proposal.setLower(lower);
return distr.calcLogP(new QuietRealParameter(sampleVals));
}