void FunctionalResponseGB::update() {
if (egestionRatio < 0. || egestionRatio >= 1.) {
QString msg("Illegal value for egestionRatio (%1)");
throw Exception(msg.arg(egestionRatio));
}
// Compute total supply (i.e., total kill)
totalDemand = costOnRespiration ?
(demand + respiration)/(1-conversionCost) :
demand/(1-conversionCost) + respiration;
totalDemand /= (1. - egestionRatio);
totalSupply = GBFuncResp(totalDemand, apparency*resourceDensity);
// Allocate total supply
supply = totalSupply;
egestion = supply*egestionRatio;
supply -= egestion;
supply -= costOnRespiration ? respiration/(1-conversionCost) : respiration;
if (supply < 0.) {
sdRatio = 0.;
if (truncateSupply) supply = 0.;
}
else {
sdRatio = divBounded(supply, demand, 1.);
TestNum::snapToZero(sdRatio);
}
// Update host-parasitoid variables
if (supply > 0) {
attacksPerHost = resourceDensity > 0. ? supply/resourceDensity : 0.;
propHostsAttacked = 1. - exp(-attacksPerHost);
numHostsAttacked = resourceDensity*propHostsAttacked;
}
else {
attacksPerHost =
propHostsAttacked =
numHostsAttacked = 0.;
}
}
void FunctionalResponseGB::update() {
if (egestionRatio < 0. || egestionRatio >= 1.) {
QString msg("Illegal value for egestionRatio (%1)");
throw Exception(msg.arg(egestionRatio));
}
totalDemand = (demand + respiration)/(1. - egestionRatio);
totalSupply = GBFuncResp(totalDemand, apparancy*resourceDensity);
if (totalSupply > resourceDensity)
totalSupply = resourceDensity;
double netSupply = totalSupply*(1. - egestionRatio);
egestion = totalSupply*egestionRatio;
if (netSupply <= respiration) {
supply = sdRatio = 0;
}
else {
supply = netSupply - respiration;
sdRatio = divBounded(supply, demand, 1.);
TestNum::snapToZero(sdRatio);
}
// Update host-parasitoid variables
attacksPerHost = resourceDensity > 0. ? supply/resourceDensity : 0.;
propHostsAttacked = 1. - exp(-attacksPerHost);
numHostsAttacked = resourceDensity*propHostsAttacked;
}
