public float Defuzzify( FuzzyOutput fuzzyOutput, INorm normOperator )
{
// results and accumulators
float weightSum = 0, membershipSum = 0;
// speech universe
float start = fuzzyOutput.OutputVariable.Start;
float end = fuzzyOutput.OutputVariable.End;
// increment
float increment = ( end - start ) / this.intervals;
// running through the speech universe and evaluating the labels at each point
for ( float x = start; x < end; x += increment )
{
// we must evaluate x membership to each one of the output labels
foreach ( FuzzyOutput.OutputConstraint oc in fuzzyOutput.OutputList )
{
// getting the membership for X and constraining it with the firing strength
float membership = fuzzyOutput.OutputVariable.GetLabelMembership( oc.Label, x );
float constrainedMembership = normOperator.Evaluate( membership, oc.FiringStrength );
weightSum += x * constrainedMembership;
membershipSum += constrainedMembership;
}
}
// if no membership was found, then the membershipSum is zero and the numerical output is unknown.
if ( membershipSum == 0 )
throw new Exception( "The numerical output in unavaliable. All memberships are zero." );
return weightSum / membershipSum;
}
}
