Examples of org.apache.lucene.search.Similarity.idf()

org.apache.lucene.search.Similarity.idf()

Computes a score factor based on a term's document frequency (the number of documents which contain the term). This value is multiplied by the {@link #tf(int)} factor for each term in the query and these products arethen summed to form the initial score for a document.

Terms that occur in fewer documents are better indicators of topic, so implementations of this method usually return larger values for rare terms, and smaller values for common terms. @param docFreq the number of documents which contain the term @param numDocs the total number of documents in the collection @return a score factor based on the term's document frequency

      Term term = new Term(Field.CONTENTS.toString(), termText);
      
      float termFreq = sim.tf( termFrequencies[i] );


      int docFreq = reader.docFreq(term);
      float idf = sim.idf(docFreq, numDocs); 


      float tfIdf = termFreq * idf;


      scores[i] = tfIdf;
    }

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