Example usage for weka.associations ItemSet upDateCounter

Introduction

In this page you can find the example usage for weka.associations ItemSet upDateCounter.

Prototype

public void upDateCounter(Instance instance) 

Source Link

Document

Updates counter of item set with respect to given transaction.

Usage

From source file:cba.RuleItem.java

License:Open Source License

/**
 * Constructs a new RuleItem if the support of the given rule is above the support threshold.
 * @param premise the premise//from  ww  w .j a  v  a2  s.com
 * @param consequence the consequence
 * @param instances the instances
 * @param genTime the time of generation of the current premise and consequence
 * @param minRuleCount the support threshold
 * @param m_midPoints the mid points of the intervals
 * @param m_priors the estimated priori probabilities (in a hashtable)
 * @return a RuleItem if its support is above the threshold, null otherwise
 */
public RuleItem generateRuleItem(ItemSet premise, ItemSet consequence, Instances instances, int genTime,
        int minRuleCount, double[] m_midPoints, Hashtable m_priors) {
    ItemSet rule = new ItemSet(instances.numInstances());
    rule.m_items = new int[(consequence.m_items).length];
    System.arraycopy(premise.m_items, 0, rule.m_items, 0, (premise.m_items).length);
    for (int k = 0; k < consequence.m_items.length; k++) {
        if (consequence.m_items[k] != -1)
            rule.m_items[k] = consequence.m_items[k];
    }
    for (int i = 0; i < instances.numInstances(); i++)
        rule.upDateCounter(instances.instance(i));
    int ruleSupport = rule.support();
    if (ruleSupport > minRuleCount) {
        RuleItem newRule = new RuleItem(premise, consequence, genTime, ruleSupport, m_midPoints, m_priors);
        return newRule;
    }
    return null;
}

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