Profiling Engine SDK
Operator Reference

Operator Reference

	Operator List
	Topical List

 

Query Language

	Introduction
	Summary
	Operators
	Tips, Questions, and Answers

 

Main Index

	Index
	Tutorial
	API Functions
	Query Language
	Technology Overview
	Contact Us

 

Other Products

	Onix Text Search and Retrieval Engine
	Brevity Document Summarizer
	Lextek Document Profiler & Categorizer
	RouteX Document Routing Engine
	Lextek Language Identifier

M_AND

Name

M_AND

Synopsis

Returns records where all the terms or subqueries are present.

Arguments

M-value (bias for ranking)
List of terms and subqueries

Ranking Scheme

m * min( termweights ) + ( 1 - m ) * max( termweights )

Ranks using the mixed maximum and minimum method. This is effectively a variation of fuzzy logic that biases the result of an AND with an OR. A passed in m-value (the first argument) determines how much it is like an OR and how much like and AND. Typical values for M_AND are .5 to .8, although some experimentation may be necessary to find the best fit for your need.

Comments

M_AND requires that all the listed terms and subqueries be present in a record for any hit in that record to be returned.

Example

M_AND( 0.4, 'blue', 'green', 'red', 'orange', 'violet' );

See Also

and, all, r_and, p_and