/**
* Returns the number of distinct values of a given attribute. Returns the number of instances if
* the attribute is a string attribute. The value 'missing' is not counted.
*
* @param attIndex the attribute (index starts with 0)
* @return the number of distinct values of a given attribute
*/
public int numDistinctValues(int attIndex) {
MyAttribute att = getAttribute(attIndex);
if (att.isContinuous()) {
double[] attVals = attributeToDoubleArray(attIndex);
Utilities.mergeSort(attVals, attVals.length);
double prev = 0;
int counter = 0;
for (int i = 0; i < size(); i++) {
if (attVals[i] == Double.NaN) {
break;
}
if ((i == 0) || (attVals[i] > prev)) {
prev = attVals[i];
counter++;
}
}
return counter;
} else {
return att.numValues();
}
}
/** Function to stores header of a data file. */
private void readHeader() {
String attributeName;
Vector attributeValues;
int i;
name = Attributes.getRelationName();
// Create vectors to hold information temporarily.
attributes = new Vector();
Attribute at;
// store attribute inputs and of the header
for (int j = 0; j < Attributes.getInputNumAttributes(); j++) {
at = Attributes.getInputAttribute(j);
attributeName = at.getName();
// check if it is real
if (at.getType() == 2) {
float min = (float) at.getMinAttribute();
float max = (float) at.getMinAttribute();
attributes.addElement(new MyAttribute(attributeName, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.setRange(min, max);
att.activate();
} else {
if (at.getType() == 1) // check if it is integer
{
int min = (int) at.getMinAttribute();
int max = (int) at.getMinAttribute();
attributes.addElement(new MyAttribute(attributeName, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.setRange(min, max);
att.activate();
} else // it is nominal
{
attributeValues = new Vector();
for (int k = 0; k < at.getNumNominalValues(); k++) {
attributeValues.addElement(at.getNominalValue(k));
}
attributes.addElement(new MyAttribute(attributeName, attributeValues, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.activate();
}
}
} // for
// store outputs of the header
at = Attributes.getOutputAttribute(0);
attributeName = at.getName();
int j = Attributes.getNumAttributes() - 1;
// check if it is real
if (at.getType() == 2) {
float min = (float) at.getMinAttribute();
float max = (float) at.getMinAttribute();
attributes.addElement(new MyAttribute(attributeName, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.setRange(min, max);
att.activate();
} else {
if (at.getType() == 1) // check if it is integer
{
int min = (int) at.getMinAttribute();
int max = (int) at.getMinAttribute();
attributes.addElement(new MyAttribute(attributeName, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.setRange(min, max);
att.activate();
} else // it is nominal
{
attributeValues = new Vector();
for (int k = 0; k < at.getNumNominalValues(); k++) {
attributeValues.addElement(at.getNominalValue(k));
}
attributes.addElement(new MyAttribute(attributeName, attributeValues, j));
MyAttribute att = (MyAttribute) attributes.elementAt(j);
att.activate();
}
}
// set the index of the output class
classIndex = Attributes.getNumAttributes() - 1;
}