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From Andy <>
Subject Piece of coded needed
Date Fri, 24 Apr 2009 21:09:21 GMT

--- On Sat, 4/25/09, <> wrote:

From: <>
Subject: Piece of coded needed
Date: Saturday, April 25, 2009, 1:37 AM

Hi every body

I know it may seem stupid, but I'm in the middle of a research and I need a piece of code
in lucene to give me a weight matrix of a text collection and a given query:

W i,j = (f i,j)x(idf i) 
AND    for the query:  
W i,q = (0.5 + (0.5xfreq i,q)/Max(freq i,q))x (idf i )


f i,j = Normilize frequency = freq i,j / Max(freq j)
freq i,j = frequency of (k i) in document j (d j)

idf i= log(N/(n i))                      idf= Inverse Document Frequency
N = total number of documents in the collection
n i = number of documents which has the TERM i (k i)

could any body help?
Many thanks in advance
best wishes to all


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