Cosine Similarity

Question

I calculated tf/idf values of two documents. The following are the tf/idf values:

1.txt
0.0
0.5
2.txt
0.0
0.5

The documents are like:

Answer 1

simple java code implementation:

  static double cosine_similarity(Map v1, Map v2) {
            Set both = Sets.newHashSet(v1.keySet());
            both.retainAll(v2.keySet());
            double sclar = 0, norm1 = 0, norm2 = 0;
            for (String k : both) sclar += v1.get(k) * v2.get(k);
            for (String k : v1.keySet()) norm1 += v1.get(k) * v1.get(k);
            for (String k : v2.keySet()) norm2 += v2.get(k) * v2.get(k);
            return sclar / Math.sqrt(norm1 * norm2);
    }