public static Map<Integer, List<Double>> getDerivative(
List<Double> tList, List<Double> tauList, List<Double> pefList) {
Map<Integer, List<Double>> resultMap = new HashMap<>(tList.size());
List<Double> sumOfExponent = GeneratorHelper.generateData(tauList, pefList, false, false);
int numOfParam = 0;
for (int i = 0; i < tauList.size(); i++) {
List<Double> tauModList = new ArrayList<>(tauList);
List<Double> pefModList = new ArrayList<>(pefList);
Double tauH = delta * tauList.get(i);
Double pefH = delta * pefList.get(i);
tauModList.set(i, tauModList.get(i) + tauH);
List<Double> tauSOEModList = GeneratorHelper.generateData(tauModList, pefList, false, false);
pefModList.set(i, pefModList.get(i) + pefH);
List<Double> pefSOEModList = GeneratorHelper.generateData(tauList, pefModList, false, false);
resultMap.put(numOfParam++, getDifference(tauSOEModList, sumOfExponent, tauH));
resultMap.put(numOfParam++, getDifference(pefSOEModList, sumOfExponent, pefH));
}
return resultMap;
}
public static List<Double> getChiSquarePartDiff(
int m,
List<Double> feList,
List<Double> tList,
List<Double> tauTheorList,
List<Double> peTheorList) {
int size = tList.size();
List<Double> result = new ArrayList<>(m);
Map<Integer, List<Double>> partDivOfSumOfExp = getDerivative(tList, tauTheorList, peTheorList);
List<Double> ftList = GeneratorHelper.generateData(tauTheorList, peTheorList, false, false);
for (int i = 0; i < m; i++) {
double sum = 0;
List<Double> param =
partDivOfSumOfExp.get(i); // Частная производная по i параметру во всех точках t.
for (int j = 0; j < size; j++) {
if (feList.get(j) == 0) {
continue;
}
sum += (feList.get(j) - ftList.get(j)) * param.get(j) / feList.get(j);
}
result.add(sum);
}
return result;
}