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## 5.16. Complex similarity computations

### 5.16.1. Calculate similarities by complex calculations

Here, a similarity between two players in a game is calculated by the number of times they have eaten the same food.

Query.

    MATCH (me { name: 'me' })-[r1:ATE]->(food)<-[r2:ATE]-(you)
    WITH me,count(DISTINCT r1) AS H1,count(DISTINCT r2) AS H2,you
    MATCH (me)-[r1:ATE]->(food)<-[r2:ATE]-(you)
    RETURN sum((1-ABS(r1.times/H1-r2.times/H2))*(r1.times+r2.times)/(H1+H2)) AS similarity

The two players and their similarity measure.

Result

similarity
1 row
`-30.0`

Figure 5.19. Graph

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