protected HashMap<String, Object> selectAttribute(
ArrayList<DataInstance> instances, ArrayList<Integer> attributeList) {
Random r = new Random();
Integer attr = attributeList.get(r.nextInt(attributeList.size()));
selectedInstances = new HashMap<Integer, ArrayList<DataInstance>>();
ArrayList<DataInstance> data;
for (DataInstance di : instances) {
int value = di.getAttributes().get(attr.intValue()).intValue();
if (selectedInstances.containsKey(value)) {
data = selectedInstances.get(value);
data.add(di);
selectedInstances.put(value, data);
} else {
data = new ArrayList<DataInstance>();
data.add(di);
selectedInstances.put(value, data);
}
}
HashMap<String, Object> choice = new HashMap<String, Object>();
choice.put("attribute", attr);
choice.put("discrete", "true");
choice.put("multiway", "true");
return choice;
}
