Method update

SRC/analysis/integrator/HHT.cpp:358–401

int HHT::update(const Vector &deltaU)
{
    AnalysisModel *theModel = this->getAnalysisModel();
    if (theModel == 0)  {
        opserr << "WARNING HHT::update() - no AnalysisModel set\n";
        return -1;
    }
    
    // check domainChanged() has been called, i.e. Ut will not be zero
    if (Ut == 0)  {
        opserr << "WARNING HHT::update() - domainChange() failed or not called\n";
        return -2;
    }
    
    // check deltaU is of correct size
    if (deltaU.Size() != U->Size())  {
        opserr << "WARNING HHT::update() - Vectors of incompatible size ";
        opserr << " expecting " << U->Size() << " obtained " << deltaU.Size() << endln;
        return -3;
    }
    
    //  determine the response at t+deltaT
    (*U) += deltaU;
    
    Udot->addVector(1.0, deltaU, c2);
    
    Udotdot->addVector(1.0, deltaU, c3);
    
    // determine displacement and velocity at t+alpha*deltaT
    (*Ualpha) = *Ut;
    Ualpha->addVector((1.0-alpha), *U, alpha);
    
    (*Ualphadot) = *Utdot;
    Ualphadot->addVector((1.0-alpha), *Udot, alpha);
    
    // update the response at the DOFs
    theModel->setResponse(*Ualpha,*Ualphadot,*Udotdot);
    if (theModel->updateDomain() < 0)  {
        opserr << "HHT::update() - failed to update the domain\n";
        return -4;
    }
    
    return 0;
}


int HHT::commit(void)