Method formUnbalance

DEVELOPER/core/TransientIntegrator.cpp:121–153

    
int
TransientIntegrator::formUnbalance(void) {
    LinearSOE *theLinSOE = this->getLinearSOE();
    AnalysisModel *theModel = this->getAnalysisModel();

    if (theModel == 0 || theLinSOE == 0) {
 	opserr << "WARNING IncrementalIntegrator::formUnbalance -";
	opserr << " no AnalysisModel or LinearSOE has been set\n";
	return -1;
    }
    
    theLinSOE->zeroB();

    // do modal damping
    const Vector *modalValues = theModel->getModalDampingFactors();
    if (modalValues != 0) {
      this->addModalDampingForce(modalValues);
    }
    
    if (this->formElementResidual() < 0) {
	opserr << "WARNING IncrementalIntegrator::formUnbalance ";
	opserr << " - this->formElementResidual failed\n";
	return -1;
    }
    
    if (this->formNodalUnbalance() < 0) {
	opserr << "WARNING IncrementalIntegrator::formUnbalance ";
	opserr << " - this->formNodalUnbalance failed\n";
	return -2;
    }    

    return 0;
}
    
int
TransientIntegrator::formEleResidual(FE_Element *theEle)