Defines the X location of the XY value pair. Changing the X value may change the location (index) of the value in the collection. The X value must be between the XMaximum and XMinimum values of the fuzzy set.
Defines Y, or truth membership, for the XY value pair. The Y value typically ranges from 0 (no membership or FALSE) to 1 (full membership or TRUE), though it may be a value more than 1.
