====== Description ======
The fuzzy curve node is a proxy-node for data links (either [[simple data link|simple]] or [[calculated data link|calculated]].  It is used in conjunction with [[xy-pair]] nodes to define a dynamic fuzzy curve for very flexible analysis of data.

Each [[xy-pair]] node defines a single point on the fuzzy curve.  Because the data feeding each [[xy-pair]] nodes can change, the shape of the fuzzy curve can change dynamically.  In other words, you can build a fuzzy curve that changes shape to reflect changing conditions.

If fuzzy analysis is needed but not the dynamic ability of the fuzzy curve node then consider using a [[data link proxy]] with a [[fuzzy argument]].

====== Constraints ======
The fuxxy curve's data link must be a numeric value.  Otherwise the fuzzy curve will evaluate to undetermined, the same as if the data link had no data.

====== Calculus ======

At runtime each [[xy-pair]] is evaluated to determine their current values. 

The nodes are then used to construct a fuzzy curve in memory where each [[xy-pair]]'s current values define the transition points on the fuzzy curve.  

The data link's value defines the x position on the fuzzy curve and the corresponding y value from the curve is returned.