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VertexGenerators.hpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2019-2020 CERN for the benefit of the Acts project
4 //
5 // This Source Code Form is subject to the terms of the Mozilla Public
6 // License, v. 2.0. If a copy of the MPL was not distributed with this
7 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 
12 
13 #pragma once
14 
17 
18 #include <random>
19 
20 namespace ActsExamples {
21 
24  Acts::Vector4D fixed = Acts::Vector4D::Zero();
25 
26  Acts::Vector4D operator()(RandomEngine& /* unused */) const { return fixed; }
27 };
28 
30  // standard deviation comes first, since it is more likely to be modified
32  Acts::Vector4D stddev = {0.0, 0.0, 0.0, 0.0};
34  Acts::Vector4D mean = {0.0, 0.0, 0.0, 0.0};
35 
37  auto normal = std::normal_distribution<double>(0.0, 1.0);
38  Acts::Vector4D rndNormal = {
39  normal(rng),
40  normal(rng),
41  normal(rng),
42  normal(rng),
43  };
44  return mean + rndNormal.cwiseProduct(stddev);
45  }
46 };
47 
48 } // namespace ActsExamples