public static _SparseFeature[] createSpVct(ArrayList<HashMap<Integer, Double>> vcts) {
HashMap<Integer, _SparseFeature> spVcts = new HashMap<Integer, _SparseFeature>();
HashMap<Integer, Double> vPtr;
_SparseFeature spV;
int dim = vcts.size();
for (int i = 0; i < dim; i++) {
vPtr = vcts.get(i);
if (vPtr == null || vPtr.isEmpty())
continue; // it is possible that we are missing this dimension
// iterate through all the features in this section
Iterator<Entry<Integer, Double>> it = vPtr.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<Integer, Double> pairs = (Map.Entry<Integer, Double>) it.next();
int index = pairs.getKey();
double value = pairs.getValue();
if (spVcts.containsKey(index)) {
spV = spVcts.get(index);
spV.addValue(value); // increase the total value
} else {
spV = new _SparseFeature(index, value, dim);
spVcts.put(index, spV);
}
spV.setValue4Dim(value, i);
}
}
int size = spVcts.size();
_SparseFeature[] resultVct = spVcts.values().toArray(new _SparseFeature[size]);
Arrays.sort(resultVct);
return resultVct;
}
