Change in value of a variable according to the rise or fall of another variable.

[Phylogenius]

@Est_engine

This should be the perfect example,
Here the link https://www.raywenderlich.com/5246-u…render-targets

As you can see here this tutorial, link the AxisValue to the Brush Size, using of course some nodes for multiply, add, and clamp , and set the end value.
You can plug any variable inside the first X10, instead of the axis value, and … well… basically you can plug variable wherever you have the right kind of pin-Variable.

PS:Maybe the renderstuff is to complex, but you can use the mouse input, to move a cube, or anything else.
try something simple!

Thank you for this demonstration, as well as for the time you give me,
This is what seemed to me, there is an error on my question.
Here is more explicitly what I would like to obtain:

The arrow represents the relationship I lack for the Var 1 to serve as a pilot for the Var 2.