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Added Whiten

release/4.3a0
Frank Dellaert 2015-06-10 18:27:10 -04:00
parent 39ffe3ac32
commit 7ec26ff323
2 changed files with 10 additions and 2 deletions
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7
gtsam/linear/NoiseModel.cpp
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@ -376,8 +376,11 @@ double Constrained::distance(const Vector& v) const {
/* ************************************************************************* */
Matrix Constrained::Whiten(const Matrix& H) const {
// selective scaling
return vector_scale(invsigmas(), H, true);
Matrix A = H;
for (DenseIndex i=0; i<(DenseIndex)dim_; ++i)
if (!constrained(i)) // if constrained, leave row of A as is
A.row(i) *= invsigmas_(i);
return A;
}
/* ************************************************************************* */

5
gtsam/linear/NoiseModel.h
View File

@ -81,6 +81,9 @@ namespace gtsam {
/// Whiten an error vector.
virtual Vector whiten(const Vector& v) const = 0;
/// Whiten a matrix.
virtual Matrix Whiten(const Matrix& H) const = 0;
/// Unwhiten an error vector.
virtual Vector unwhiten(const Vector& v) const = 0;
@ -856,6 +859,8 @@ namespace gtsam {
// TODO: functions below are dummy but necessary for the noiseModel::Base
inline virtual Vector whiten(const Vector& v) const
{ Vector r = v; this->WhitenSystem(r); return r; }
inline virtual Matrix Whiten(const Matrix& A) const
{ Vector b; Matrix B=A; this->WhitenSystem(B,b); return B; }
inline virtual Vector unwhiten(const Vector& /*v*/) const
{ throw std::invalid_argument("unwhiten is not currently supported for robust noise models."); }
inline virtual double distance(const Vector& v) const