New graphs can be based on existing graphs in the current diagram. For this, the name of the base graph must be set in '' (avoids conflicts with regular parameters) as a function parameter.
The name of the graph must be an exact match with the name in the diagram. For the calculation of the new graph the x values of the existing graphs are used, and new y values calculated for them. The y value of the existing graph is available in the Y variable, the X value as usual in the X variable.
Example:
Test('tst') = y*x
If the graph 'tst' has the y value 2 for the x value 5, the function result is 2*5 = 10.