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is another example of a matching function
...A popular one used by the SMART project,which they call cosine correlation,assumes that the document and query are represented as numerical vectors in t space,that is Q q 1,q 2,...or,in the notation for a vector space with a Euclidean norm,where [[theta]]is the angle between vectors Q and D
...Serial search Although serial searches are acknowledge to be slow,they are frequently still used as parts of larger systems
...Suppose there are N documents Di in the system,then the serial search proceeds by calculating N values M Q,Di the set of documents to be retrieved is determined
...1 the matching function is given a suitable threshold,retrieving the documents above the threshold and discarding the ones below
...2 the documents are ranked in increasing order of matching function value
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