Computes a score factor for a simple term.

The default implementation is:

            return idf(searcher.docFreq(term), searcher.maxDoc());
            

Note that {@link Searcher#MaxDoc()} is used instead of {@link Lucene.Net.Index.IndexReader#NumDocs()} because it is proportional to {@link Searcher#DocFreq(Term)} , i.e., when one is inaccurate, so is the other, and in the same direction.

[ObsoleteAttribute("see IdfExplain(Term, Searcher)")]
public virtual float Idf(
	Term term,
	Searcher searcher
)

<ObsoleteAttribute("see IdfExplain(Term, Searcher)")> _
Public Overridable Function Idf ( _
	term As Term, _
	searcher As Searcher _
) As Single

[ObsoleteAttribute(L"see IdfExplain(Term, Searcher)")]
public:
virtual float Idf(
	Term^ term, 
	Searcher^ searcher
)