1 files changed, 17 insertions, 0 deletions
diff --git a/core/scoring/idf.go b/core/scoring/idf.go
new file mode 100644
index 0000000..f5aaecd
--- /dev/null
+++ b/core/scoring/idf.go
@@ -0,0 +1,17 @@
+package scoring
+
+import (
+	"math"
+	"searchEngine/core/index"
+)
+
+func CalculateIDF(totalDocs int, docFrequency int) float64 {
+	if docFrequency == 0 {
+		return 0.0
+	}
+	return math.Log10(float64(totalDocs) / float64(docFrequency))
+}
+
+func ScoreTFIDF(p index.Posting, idf float64) float64 {
+	return FieldScore(p) * idf
+}