commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/twod/Vector2D.java [583:593]:
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    private static Vector2D computeCentroid(final Vector2D first, final Iterator<? extends Vector2D> more) {
        final Sum sum = Sum.of(first);
        int count = 1;

        while (more.hasNext()) {
            sum.add(more.next());
            ++count;
        }

        return sum.get().multiply(1.0 / count);
    }
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commons-geometry-euclidean/src/main/java/org/apache/commons/geometry/euclidean/threed/Vector3D.java [652:662]:
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    private static Vector3D computeCentroid(final Vector3D first, final Iterator<? extends Vector3D> more) {
        final Sum sum = Sum.of(first);
        int count = 1;

        while (more.hasNext()) {
            sum.add(more.next());
            ++count;
        }

        return sum.get().multiply(1.0 / count);
    }
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