On 4/6/07, James Kim <[EMAIL PROTECTED]> wrote:
> Is there any way to count the frequency of specific term in one
> document?
> I can't find any method... Do you?
Hi James,
Caleb and I answered your previous post but here is my answer again.
You can find the frequency without storing term-vectors. Simply use
the TermDocEnum and skip to the document you are interested.
tde = index.reader.term_docs_for(:field, 'term')
tde.skip_to(100)
# now check that we are at the correct document. If there are no
# instances of 'term' in document 100 then it will skip to the next
# document with an instance of the term 'term'
frequency = tde.doc == 100 ? tde.freq : 0
puts "frequency of field:term in document 100 is #{frequency}"
Here is a full working example;
require 'rubygems'
require 'ferret'
index = Ferret::I.new
index << 'one'
index << 'one two one three one four one' # doc 1
index << 'one'
index << 'no 1s' # doc 3
index << 'one'
def get_frequency(index, doc_num, term, field = :id)
tde = index.reader.term_docs_for(field, term)
tde.skip_to(doc_num)
return tde.doc == doc_num ? tde.freq : 0
end
puts get_frequency(index, 1, 'one') #=> 4
puts get_frequency(index, 3, 'one') #=> 0
--
Dave Balmain
http://www.davebalmain.com/
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