Method update

SRC/analysis/integrator/HHTExplicit.cpp:369–413

int HHTExplicit::update(const Vector &aiPlusOne)
{
    updateCount++;
    if (updateCount > 1)  {
        opserr << "WARNING HHTExplicit::update() - called more than once -";
        opserr << " HHTExplicit integration scheme requires a LINEAR solution algorithm\n";
        return -1;
    }
    
    AnalysisModel *theModel = this->getAnalysisModel();
    if (theModel == 0)  {
        opserr << "WARNING HHTExplicit::update() - no AnalysisModel set\n";
        return -2;
    }
    
    // check domainChanged() has been called, i.e. Ut will not be zero
    if (Ut == 0)  {
        opserr << "WARNING HHTExplicit::update() - domainChange() failed or not called\n";
        return -3;
    }
    
    // check aiPlusOne is of correct size
    if (aiPlusOne.Size() != U->Size())  {
        opserr << "WARNING HHTExplicit::update() - Vectors of incompatible size ";
        opserr << " expecting " << U->Size() << " obtained " << aiPlusOne.Size() << endln;
        return -4;
    }
    
    //  determine the response at t+deltaT
    Udot->addVector(1.0, aiPlusOne, c2);
    
    Udotdot->addVector(0.0, aiPlusOne, c3);
    
    // update the response at the DOFs
    theModel->setVel(*Udot);
    theModel->setAccel(*Udotdot);
    if (theModel->updateDomain() < 0)  {
        opserr << "HHTExplicit::update() - failed to update the domain\n";
        return -5;
    }
    // do not update displacements in elements only at nodes
    theModel->setDisp(*U);
    
    return 0;
}


int HHTExplicit::commit(void)