Package org.grouplens.lenskit.vectors

Examples of org.grouplens.lenskit.vectors.SparseVector.sum()

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        ratings.add(Ratings.make(7, 5, 3.5));
        ratings.add(Ratings.make(3, 5, 1.5));
        ratings.add(Ratings.make(8, 5, 2));
        SparseVector v = Ratings.itemRatingVector(ratings);
        assertEquals(3, v.size());
        assertEquals(7, v.sum(), EPSILON);

        long[] keys = {3, 7, 8};
        double[] values = {1.5, 3.5, 2};
        SparseVector sv = MutableSparseVector.wrap(keys, values);
        assertEquals(sv, v);
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                Ratings.make(5, 3, 1.5),
                Ratings.make(5, 8, 2)
        );
        SparseVector v = Ratings.userRatingVector(ratings);
        assertEquals(3, v.size());
        assertEquals(7, v.sum(), EPSILON);

        long[] keys = {3, 7, 8};
        double[] values = {1.5, 3.5, 2};
        SparseVector sv = MutableSparseVector.wrap(keys, values);
        assertEquals(sv, v);
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