Class Zend_Search_Lucene_Search_Similarity_Default

Description
Description | Vars | Methods (details)

Located in /Zend/Search/Lucene/Search/Similarity/Default.php (line 28) 

Zend_Search_Lucene_Search_Similarity
   |
   --Zend_Search_Lucene_Search_Similarity_Default
Method Summary
Description | Vars | Methods (details)
float coord (integer $overlap, integer $maxOverlap)
float idfFreq (integer $docFreq, integer $numDocs)
float lengthNorm (string $fieldName, integer $numTerms)
float queryNorm (float $sumOfSquaredWeights)
float sloppyFreq (integer $distance)
float tf (float $freq)
Variables
Description | Vars (details) | Methods (details)

Inherited Variables

Inherited from Zend_Search_Lucene_Search_Similarity

Zend_Search_Lucene_Search_Similarity::$_defaultImpl
 Zend_Search_Lucene_Search_Similarity::$_normTable
Methods
Description | Vars Methods (details)
coord (line 95)

Implemented as 'overlap/maxOverlap'.

  • access: public
float coord (integer $overlap, integer $maxOverlap)
  • integer $overlap
  • integer $maxOverlap
Redefinition of:
Zend_Search_Lucene_Search_Similarity::coord()
Computes a score factor based on the fraction of all query terms that a document contains. This value is multiplied into scores.
idfFreq (line 83)

Implemented as 'log(numDocs/(docFreq+1)) + 1'.

  • access: public
float idfFreq (integer $docFreq, integer $numDocs)
  • integer $docFreq
  • integer $numDocs
Redefinition of:
Zend_Search_Lucene_Search_Similarity::idfFreq()
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 tf(int) factor for each term in the query and these products are then summed to form the initial score for a document.
lengthNorm (line 38)

Implemented as '1/sqrt(numTerms)'.

  • access: public
float lengthNorm (string $fieldName, integer $numTerms)
  • string $fieldName
  • integer $numTerms: numTerms
Redefinition of:
Zend_Search_Lucene_Search_Similarity::lengthNorm()
Computes the normalization value for a field given the total number of terms contained in a field. These values, together with field boosts, are stored in an index and multipled into scores for hits on each field by the search code.
queryNorm (line 49)

Implemented as '1/sqrt(sumOfSquaredWeights)'.

  • access: public
float queryNorm (float $sumOfSquaredWeights)
  • float $sumOfSquaredWeights
Redefinition of:
Zend_Search_Lucene_Search_Similarity::queryNorm()
Computes the normalization value for a query given the sum of the squared weights of each of the query terms. This value is then multipled into the weight of each query term.
sloppyFreq (line 71)

Implemented as '1/(distance + 1)'.

  • access: public
float sloppyFreq (integer $distance)
  • integer $distance
Redefinition of:
Zend_Search_Lucene_Search_Similarity::sloppyFreq()
Computes the amount of a sloppy phrase match, based on an edit distance.
tf (line 60)

Implemented as 'sqrt(freq)'.

  • access: public
float tf (float $freq)
  • float $freq
Redefinition of:
Zend_Search_Lucene_Search_Similarity::tf()
Computes a score factor based on a term or phrase's frequency in a document. This value is multiplied by the idf(Term, Searcher) factor for each term in the query and these products are then summed to form the initial score for a document.

Inherited Methods

Inherited From Zend_Search_Lucene_Search_Similarity

Zend_Search_Lucene_Search_Similarity::coord()
Zend_Search_Lucene_Search_Similarity::decodeNorm()
Zend_Search_Lucene_Search_Similarity::encodeNorm()
Zend_Search_Lucene_Search_Similarity::getDefault()
Zend_Search_Lucene_Search_Similarity::idf()
Zend_Search_Lucene_Search_Similarity::idfFreq()
Zend_Search_Lucene_Search_Similarity::lengthNorm()
Zend_Search_Lucene_Search_Similarity::queryNorm()
Zend_Search_Lucene_Search_Similarity::setDefault()
Zend_Search_Lucene_Search_Similarity::sloppyFreq()
Zend_Search_Lucene_Search_Similarity::tf()
Zend_Search_Lucene_Search_Similarity::_floatToByte()

Documentation generated on Tue, 18 Apr 2006 11:54:45 -0700 by phpDocumentor 1.3.0RC3