question: public double calculateExcitatoryRatio ( ) { excitatoryRatio = exSynapseSet . size ( ) / ( double ) size ( ) ; if ( Double . isNaN ( excitatoryRatio ) ) { return 0 ; } return excitatoryRatio ; }
target:  If a randomize operation changes the ratio of excitatory to inhibitory synapses, this method can be called to change the excitatoryRatio to reflect this value. This happens rarely, and generally speaking is not recommended outside prototyping.