void normalizeVec(
const Eigen::MatrixBase<Derived>& x,
typename Derived::PlainObject& x_norm,
typename Gradient<Derived, Derived::RowsAtCompileTime, 1>::type* dx_norm,
typename Gradient<Derived, Derived::RowsAtCompileTime, 2>::type* ddx_norm) {
typename Derived::Scalar xdotx = x.squaredNorm();
typename Derived::Scalar norm_x = std::sqrt(xdotx);
x_norm = x / norm_x;
if (dx_norm) {
dx_norm->setIdentity(x.rows(), x.rows());
(*dx_norm) -= x * x.transpose() / xdotx;
(*dx_norm) /= norm_x;
if (ddx_norm) {
auto dx_norm_transpose = transposeGrad(*dx_norm, x.rows());
auto ddx_norm_times_norm = -matGradMultMat(x_norm, x_norm.transpose(), (*dx_norm), dx_norm_transpose);
auto dnorm_inv = -x.transpose() / (xdotx * norm_x);
(*ddx_norm) = ddx_norm_times_norm / norm_x;
auto temp = (*dx_norm) * norm_x;
int n = x.rows();
for (int col = 0; col < n; col++) {
auto column_as_matrix = (dnorm_inv(0, col) * temp);
for (int row_block = 0; row_block < n; row_block++) {
ddx_norm->block(row_block * n, col, n, 1) += column_as_matrix.col(row_block);
}
}
}
}
}
void MSF_MeasurementBase<EKFState_T>::calculateAndApplyCorrection(
shared_ptr<EKFState_T> state, MSF_Core<EKFState_T>& core,
const Eigen::MatrixBase<H_type>& H_delayed,
const Eigen::MatrixBase<Res_type> & res_delayed,
const Eigen::MatrixBase<R_type>& R_delayed) {
EIGEN_STATIC_ASSERT_FIXED_SIZE (H_type);
EIGEN_STATIC_ASSERT_FIXED_SIZE (R_type);
// Get measurements.
/// Correction from EKF update.
Eigen::Matrix<double, MSF_Core<EKFState_T>::nErrorStatesAtCompileTime, 1> correction_;
R_type S;
Eigen::Matrix<double, MSF_Core<EKFState_T>::nErrorStatesAtCompileTime,
R_type::RowsAtCompileTime> K;
typename MSF_Core<EKFState_T>::ErrorStateCov & P = state->P;
S = H_delayed * P * H_delayed.transpose() + R_delayed;
K = P * H_delayed.transpose() * S.inverse();
correction_ = K * res_delayed;
const typename MSF_Core<EKFState_T>::ErrorStateCov KH =
(MSF_Core<EKFState_T>::ErrorStateCov::Identity() - K * H_delayed);
P = KH * P * KH.transpose() + K * R_delayed * K.transpose();
// Make sure P stays symmetric.
P = 0.5 * (P + P.transpose());
core.applyCorrection(state, correction_);
}
SOPHUS_FUNC bool isOrthogonal(Eigen::MatrixBase<D> const& R) {
using Scalar = typename D::Scalar;
static int const N = D::RowsAtCompileTime;
static int const M = D::ColsAtCompileTime;
static_assert(N == M, "must be a square matrix");
static_assert(N >= 2, "must have compile time dimension >= 2");
return (R * R.transpose() - Matrix<Scalar, N, N>::Identity()).norm() <
Constants<Scalar>::epsilon();
}
inline void unSkew(const Eigen::MatrixBase<Matrix3> & M,
const Eigen::MatrixBase<Vector3> & v)
{
EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(Vector3,3);
EIGEN_STATIC_ASSERT_MATRIX_SPECIFIC_SIZE(Matrix3,3,3);
assert((M + M.transpose()).isMuchSmallerThan(M));
Vector3 & v_ = const_cast<Eigen::MatrixBase<Vector3> &>(v).derived();
typedef typename Vector3::RealScalar Scalar;
v_[0] = Scalar(0.5) * (M(2,1) - M(1,2));
v_[1] = Scalar(0.5) * (M(0,2) - M(2,0));
v_[2] = Scalar(0.5) * (M(1,0) - M(0,1));
}
void least_squares_eqcon(Eigen::MatrixBase<data1__> &x, const Eigen::MatrixBase<data2__> &A, const Eigen::MatrixBase<data3__> &b, const Eigen::MatrixBase<data4__> &B, const Eigen::MatrixBase<data5__> &d)
{
typedef Eigen::Matrix<typename Eigen::MatrixBase<data4__>::Scalar, Eigen::Dynamic, Eigen::Dynamic> B_matrixD;
B_matrixD Q, R, temp_B, temp_R;
typedef Eigen::Matrix<typename Eigen::MatrixBase<data2__>::Scalar, Eigen::Dynamic, Eigen::Dynamic> A_matrixD;
A_matrixD A1, A2, temp_A;
typedef Eigen::Matrix<typename Eigen::MatrixBase<data5__>::Scalar, Eigen::Dynamic, Eigen::Dynamic> d_matrixD;
d_matrixD y;
typedef Eigen::Matrix<typename Eigen::MatrixBase<data3__>::Scalar, Eigen::Dynamic, Eigen::Dynamic> b_matrixD;
b_matrixD z, rhs;
typedef Eigen::Matrix<typename Eigen::MatrixBase<data1__>::Scalar, Eigen::Dynamic, Eigen::Dynamic> x_matrixD;
x_matrixD x_temp(A.cols(), b.cols());
typename A_matrixD::Index p(B.rows()), n(A.cols());
#ifdef DEBUG
typename A_matrixD::Index m(b.rows());
#endif
// build Q and R
Eigen::HouseholderQR<B_matrixD> qr(B.transpose());
Q=qr.householderQ();
temp_B=qr.matrixQR();
temp_R=Eigen::TriangularView<B_matrixD, Eigen::Upper>(temp_B);
R=temp_R.topRows(p);
assert((R.rows()==p) && (R.cols()==p));
assert((Q.rows()==n) && (Q.cols()==n));
// build A1 and A2
temp_A=A*Q;
A1=temp_A.leftCols(p);
A2=temp_A.rightCols(n-p);
#ifdef DEBUG
assert((A1.rows()==m) && (A1.cols()==p));
assert((A2.rows()==m) && (A2.cols()==n-p));
#endif
assert(A1.cols()==p);
assert(A2.cols()==n-p);
// solve for y
y=R.transpose().lu().solve(d);
// setup the unconstrained optimization
rhs=b-A1*y;
least_squares_uncon(z, A2, rhs);
// build the solution
x_temp.topRows(p)=y;
x_temp.bottomRows(n-p)=z;
x=Q*x_temp;
}
SOPHUS_FUNC bool isScaledOrthogonalAndPositive(Eigen::MatrixBase<D> const& sR) {
using Scalar = typename D::Scalar;
static int const N = D::RowsAtCompileTime;
static int const M = D::ColsAtCompileTime;
using Eigen::numext::pow;
using Eigen::numext::sqrt;
Scalar det = sR.determinant();
if (det <= Scalar(0)) {
return false;
}
Scalar scale_sqr = pow(det, Scalar(2. / N));
static_assert(N == M, "must be a square matrix");
static_assert(N >= 2, "must have compile time dimension >= 2");
return (sR * sR.transpose() - scale_sqr * Matrix<Scalar, N, N>::Identity())
.template lpNorm<Eigen::Infinity>() <
sqrt(Constants<Scalar>::epsilon());
}
inline void approximateNearestOrthogonalMatrix(const Eigen::MatrixBase<Derived>& R)
{
Eigen::Matrix3d E = R.transpose() * R;
E.diagonal().array() -= 1;
const_cast<Eigen::MatrixBase<Derived>&>(R) -= 0.5 * R * E;
}
inline
typename Eigen::MatrixBase<Derived>::ConstTransposeReturnType
static trans(const Eigen::MatrixBase<Derived>& mat) {
return mat.transpose();
}
