64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
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/*
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* SimpleRotation.cpp
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*
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* This is a super-simple example of optimizing a single rotation according to a single prior
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* yet it is quite painful (took 1.5 hours to code from scratch) and is overly complex
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* An example like this should be very easy to do, so let's work at it.
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*
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* Created on: Jul 1, 2010
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* @Author: Frank Dellaert
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* @Author: Alex Cunningham
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*/
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#include <math.h>
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#include <gtsam/inference/Key.h>
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#include <gtsam/slam/PriorFactor.h>
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#include <gtsam/geometry/Rot2.h>
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#include <gtsam/linear/NoiseModel.h>
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#include <gtsam/nonlinear/LieConfig-inl.h>
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#include <gtsam/nonlinear/NonlinearFactorGraph-inl.h>
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#include <gtsam/nonlinear/NonlinearOptimizer-inl.h>
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/*
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* TODO: make factors independent of Config
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* TODO: get rid of excessive shared pointer stuff: mostly gone
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* TODO: make toplevel documentation
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* TODO: investigate whether we can just use ints as keys
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*/
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using namespace std;
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using namespace gtsam;
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typedef TypedSymbol<Rot2, 'x'> Key;
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typedef LieConfig<Key> Config;
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typedef NonlinearFactorGraph<Config> Graph;
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typedef Factorization<Graph,Config> Solver;
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typedef NonlinearOptimizer<Graph,Config> Optimizer;
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const double degree = M_PI / 180;
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int main() {
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// optimize a unary factor on rotation 1
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// Create a factor
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Rot2 prior1 = Rot2::fromAngle(30 * degree);
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SharedDiagonal model1 = noiseModel::Isotropic::Sigma(1, 1 * degree);
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Key key1(1);
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PriorFactor<Config, Key> factor1(key1, prior1, model1);
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// Create a factor graph
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Graph graph;
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graph.add(factor1);
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// and an initial estimate
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Config initialEstimate;
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initialEstimate.insert(1, Rot2::fromAngle(20 * degree));
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// create an ordering
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Optimizer::shared_config result = Optimizer::optimizeLM(graph, initialEstimate, Optimizer::LAMBDA);
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GTSAM_PRINT(*result);
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return 0;
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}
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