Y max is the high limit for acceptable values of Y i .
R is a constant that can take different values.
By changing the constant R it is also here possible to specify many different membership functions. Values of R above 1.0 will result in a slow increase from the unacceptable limits and fast near the target value. If the constant R has the value 1.0, the function will be strictly proportional between the limits and the target value. Values of R below 1.0 will result in a fast increase from the unacceptable limits and slow near the target value. The shape of the target membership function with different values of the constant R .