Method update

SRC/element/shell/ASDShellQ4.cpp:1084–1090

}

int ASDShellQ4::update()
{
    // calculate
    auto& LHS = ASDShellQ4Globals::instance().LHS;
    auto& RHS = ASDShellQ4Globals::instance().RHS;
    return calculateAll(LHS, RHS, (OPT_UPDATE));
}

const Matrix& ASDShellQ4::getTangentStiff()
{