Smoothed Curves 
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If you join points with a tilde (~), the graph tool will draw a smoothed line joining the points.
For example, if you enter (10,4)~(5,3)~(1,1)~(6,8)~(10,4) as your function, the graph tool will draw this graph.
You can mix ~ and + in the same function.
(10,4)~(5,3)+(1,1)~(6,8)~(10,4)
The smoothed curves do not have to be left to right. In other words, they do not need to represent a function.
(10,4)~(5,3)~(1,1)~(6,8)~(10,4)~(6,10)~(5,5)
