/**
* Adjust the state of this operation.
*
* @param chromosomeArrayData Chromosome array data that will modify the internal state
* @throws AnalyticException if there is a computational error
*/
public final void adjustState(final ChromosomeArrayData chromosomeArrayData)
throws AnalyticException {
for (ArrayDatum ad : chromosomeArrayData.getArrayData()) {
if (this.operation == MEAN) {
this.sum += ad.getValue();
this.numDatum++;
} else if (this.operation == MEDIAN) {
this.values.add(ad.getValue());
}
}
this.sorted = false;
}
/**
* Perform operation.
*
* @param input Input data
* @return Output data
* @throws AnalyticException if an error occurs during this operation
*/
public final ChromosomeArrayData perform(final ChromosomeArrayData input)
throws AnalyticException {
// Make sure mean or median can be calculated
if (this.operation == MEAN) {
if (this.numDatum == 0) {
throw new AnalyticException("Cannot compute mean over 0 values");
}
} else if (this.operation == MEDIAN) {
if (this.values.size() == 0) {
throw new RuntimeException("Cannot compute median over 0 values");
}
}
// Calculate mean or median, as appropriate
float stat = (float) 0.0;
if (this.operation == MEAN) {
stat = this.sum / (float) this.numDatum;
} else if (this.operation == MEDIAN) {
if (!this.sorted) {
Collections.sort(this.values);
this.sorted = true;
}
stat = this.values.get(this.values.size() / 2);
}
// Iterate over datum and subtract mean or median
ChromosomeArrayData output = new ChromosomeArrayData(input.getChromosome());
for (ArrayDatum ad : input.getArrayData()) {
ArrayDatum newAd = new ArrayDatum(ad);
newAd.setValue(ad.getValue() - stat);
output.add(newAd);
}
return output;
}
