Exemplo n.º 1
0
void IGradient::Gradient(const RnFunction *f, double step, const DoubleVector &x, DoubleVector &g)
{
    double h = step;
    for (unsigned int i=0; i<g.length(); i++)
    {
        double cx = x[i];
        const_cast<DoubleVector&>(x)[i] = cx - h;
        double f1 = f->fx(x);
        const_cast<DoubleVector&>(x)[i] = cx + h;
        double f2 = f->fx(x);
        const_cast<DoubleVector&>(x)[i] = cx;
        g[i] = (f2 - f1) / (2.0 * h);
    }
}
Exemplo n.º 2
0
void HeatControl2Delta::gradient(const DoubleVector& x, DoubleVector& g)
{
    px = &x;
    DoubleMatrix u;
    IParabolicEquation2D::calculateMVD(u, h1, h2, ht, N1, N2, M, a1, a2);

    pu = &u;
    DoubleCube psi;
    IBackwardParabolicEquation2D::calculateMVD(psi, h1, h2, ht, N1, N2, M, a1, a2);

    for (unsigned int i=0; i<g.length(); i++) g[i] = 0.0;

    for (unsigned int k=M; k!=(unsigned int)0-1; k--)
    {
        calculateGX(x, psi.matrix(k), g, k);
        //calculateGF(x, psi[k], g, k);
    }

    //    for (unsigned int k=0; k<=M; k++)
    //    {
    //        unsigned int i1 = (unsigned int)round(E[0]/h1);
    //        unsigned int j1 = (unsigned int)round(E[1]/h2);
    //        g[0*(M+1)+k] = -psi[k][j1][i1] + 2.0*alpha*(v[0*(M+1)+k] - v1(k*ht));

    //        unsigned int i2 = (unsigned int)round(E[2]/h1);
    //        unsigned int j2 = (unsigned int)round(E[3]/h2);
    //        g[1*(M+1)+k] = -psi[k][j2][i2] + 2.0*alpha*(v[1*(M+1)+k] - v2(k*ht));

    //        unsigned int i3 = (unsigned int)round(E[4]/h1);
    //        unsigned int j3 = (unsigned int)round(E[5]/h2);
    //        g[2*(M+1)+k] = -psi[k][j3][i3] + 2.0*alpha*(v[2*(M+1)+k] - v3(k*ht));
    //    }

    psi.clear();
    //    IGradient::Gradient(this, 0.0001, x, g);
}
Exemplo n.º 3
0
void IFunctional::gradient(const DoubleVector &pv, DoubleVector &g) const
{
    IFunctional *ifunc = const_cast<IFunctional*>(this);
    unsigned int L = mTimeDimension.sizeN();
    double ht = mTimeDimension.step();

    ifunc->fromVector(pv, ifunc->mParameter);
    forward->setParameter(mParameter);
    backward->setParameter(mParameter);

    DoubleMatrix u;
    DoubleMatrix p;

    vector<ExtendedSpaceNode2D> u_info;
    forward->calculateMVD(u, u_info, true);

    backward->u = &u;
    backward->U = &ifunc->U;
    backward->info = &u_info;
    vector<ExtendedSpaceNode2D> p_info;
    backward->calculateMVD(p, p_info, true);

    g.clear();
    g.resize(pv.length(), 0.0);
    unsigned int gi = 0;

    // k
    if (optimizeK)
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            ExtendedSpaceNode2D &pi = p_info[i];

            for (unsigned int j=0; j<mParameter.Lo; j++)
            {
                ExtendedSpaceNode2D &uj = u_info[j];

                double grad_Kij = 0.0;

                grad_Kij += 0.5 * (pi.value(0)+2.0*r*gpi(i,0,u_info)*sgn(g0i(i,0,u_info))) * (uj.value(0) - mParameter.z.at(i,j));
                for (unsigned int m=1; m<=L-1; m++)
                {
                    grad_Kij += (pi.value(m)+2.0*r*gpi(i,m,u_info)*sgn(g0i(i,m,u_info))) * (uj.value(m) - mParameter.z.at(i,j));
                }
                grad_Kij += 0.5 * (pi.value(L)+2.0*r*gpi(i,L,u_info)*sgn(g0i(i,L,u_info))) * (uj.value(L) - mParameter.z.at(i,j));
                grad_Kij *= -ht;

                g[gi++] = grad_Kij + 2.0*regEpsilon*(mParameter.k.at(i,j) - mParameter0.k.at(i,j));
            }
        }
    }
    else
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            for (unsigned int j=0; j<mParameter.Lo; j++)
            {
                g[gi++] = 0.0;
            }
        }
    }

    // z
    if (optimizeZ)
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            ExtendedSpaceNode2D &pi = p_info[i];

            for (unsigned int j=0; j<mParameter.Lo; j++)
            {
                double grad_Zij = 0.0;

                grad_Zij += 0.5 * (pi.value(0)+2.0*r*gpi(i,0,u_info)*sgn(g0i(i,0,u_info))) * mParameter.k.at(i,j);
                for (unsigned int m=1; m<=L-1; m++)
                {
                    grad_Zij += (pi.value(m)+2.0*r*gpi(i,m,u_info)*sgn(g0i(i,m,u_info)))  * mParameter.k.at(i,j);
                }
                grad_Zij += 0.5 * (pi.value(L)+2.0*r*gpi(i,L,u_info)*sgn(g0i(i,L,u_info))) * mParameter.k.at(i,j);
                grad_Zij *= ht;

                g[gi++] = grad_Zij + 2.0*regEpsilon*(mParameter.z[i][j] - mParameter0.z[i][j]);
            }
        }
    }
    else
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            for (unsigned int j=0; j<mParameter.Lo; j++)
            {
                g[gi++] = 0.0;
            }
        }
    }

    // xi
    if (optimizeO)
    {
        for (unsigned int j=0; j<mParameter.Lo; j++)
        {
            ExtendedSpaceNode2D &uj = u_info[j];

            double gradXijX = 0.0;
            double gradXijY = 0.0;
            double vi = 0.0;

            vi = 0.0;
            for (unsigned int i=0; i<mParameter.Lc; i++) vi += mParameter.k.at(i,j) * (p_info[i].value(0)+2.0*r*gpi(i,0,u_info)*sgn(g0i(i,0,u_info)));
            gradXijX += 0.5 * uj.valueDx(0) * vi;
            gradXijY += 0.5 * uj.valueDy(0) * vi;

            for (unsigned int m=1; m<=L-1; m++)
            {
                vi = 0.0;
                for (unsigned int i=0; i<mParameter.Lc; i++) vi += mParameter.k.at(i,j)*(p_info[i].value(m)+2.0*r*gpi(i,m,u_info)*sgn(g0i(i,m,u_info)));
                gradXijX += uj.valueDx(m) * vi;
                gradXijY += uj.valueDy(m) * vi;
            }

            vi = 0.0;
            for (unsigned int i=0; i<mParameter.Lc; i++) vi += mParameter.k.at(i,j)*(p_info[i].value(L)+2.0*r*gpi(i,L,u_info)*sgn(g0i(i,L,u_info)));
            gradXijX += 0.5 * uj.valueDx(L) * vi;
            gradXijY += 0.5 * uj.valueDy(L) * vi;

            gradXijX *= -ht;
            gradXijY *= -ht;

            g[gi++] = gradXijX + 2.0*regEpsilon*(mParameter.xi[j].x - mParameter0.xi[j].x);
            g[gi++] = gradXijY + 2.0*regEpsilon*(mParameter.xi[j].y - mParameter0.xi[j].y);
        }
    }
    else
    {
        for (unsigned int j=0; j<mParameter.Lo; j++)
        {
            g[gi++] = 0.0;
            g[gi++] = 0.0;
        }
    }

    // eta
    if (optimizeC)
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            ExtendedSpaceNode2D &pi = p_info[i];

            double grad_EtaiX = 0.0;
            double grad_EtaiY = 0.0;
            double vi = 0.0;

            vi = 0.0;
            for (unsigned int j=0; j<mParameter.Lo; j++) vi += mParameter.k.at(i,j) * (u_info[j].value(0) - mParameter.z.at(i,j));
            grad_EtaiX += 0.5 * pi.valueDx(0) * vi;
            grad_EtaiY += 0.5 * pi.valueDy(0) * vi;

            for (unsigned int m=1; m<=L-1; m++)
            {
                vi = 0.0;
                for (unsigned int j=0; j<mParameter.Lo; j++) vi += mParameter.k.at(i,j) * (u_info[j].value(m) - mParameter.z.at(i,j));
                grad_EtaiX += pi.valueDx(m) * vi;
                grad_EtaiY += pi.valueDy(m) * vi;
            }

            vi = 0.0;
            for (unsigned int j=0; j<mParameter.Lo; j++) vi += mParameter.k.at(i,j) * (u_info[j].value(L) - mParameter.z.at(i,j));
            grad_EtaiX += 0.5 * pi.valueDx(L) * vi;
            grad_EtaiY += 0.5 * pi.valueDy(L) * vi;

            grad_EtaiX *= -ht;
            grad_EtaiY *= -ht;

            g[gi++] = grad_EtaiX + 2.0*regEpsilon*(mParameter.eta[i].x - mParameter0.eta[i].x);
            g[gi++] = grad_EtaiY + 2.0*regEpsilon*(mParameter.eta[i].y - mParameter0.eta[i].y);
        }
    }
    else
    {
        for (unsigned int i=0; i<mParameter.Lc; i++)
        {
            g[gi++] = 0.0;
            g[gi++] = 0.0;
        }
    }

    u_info.clear();
    p_info.clear();
}