/*
* The implementation for double array
*/
public double[] autoCorr(double[] xx) {
double[] ac = new double[xx.length];
int n = xx.length;
for (int j = 0; j < n; j++) {
double[] yy = new double[xx.length];
// Set y as a time-sifting (of time j) array of x.
for (int i = 0; i < n; i++) {
yy[i] = xx[(i + j) % xx.length];
}
ac[j] = Stat.corrCoeff(xx, yy);
}
return ac;
}
private void calcCorrelationMap() {
Iterator<Integer> it1 = nodemap.keySet().iterator();
while (it1.hasNext()) {
int id1 = it1.next();
Map<Integer, Double> subcsmap = new HashMap<Integer, Double>();
Iterator<Integer> it2 = nodemap.keySet().iterator();
while (it2.hasNext()) {
int id2 = it2.next();
if (id1 == id2) {
continue;
}
double[] values1 = linkedListToDoubleArray(nodemap.get(id1).values());
double[] values2 = linkedListToDoubleArray(nodemap.get(id2).values());
double correlation = Stat.corrCoeff(values1, values2);
subcsmap.put(id2, correlation);
}
correlationmap.put(id1, subcsmap);
}
}