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File indexing completed on 2026-10-26 09:34:34
0001 //------------------------------- -*- C++ -*- -------------------------------// 0002 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details 0003 // SPDX-License-Identifier: (Apache-2.0 OR MIT) 0004 //---------------------------------------------------------------------------// 0005 //! \file corecel/inp/Distributions.hh 0006 //---------------------------------------------------------------------------// 0007 #pragma once 0008 0009 #include "corecel/Types.hh" 0010 #include "corecel/cont/Array.hh" 0011 #include "corecel/math/NumericLimits.hh" 0012 0013 namespace celeritas 0014 { 0015 namespace inp 0016 { 0017 //---------------------------------------------------------------------------// 0018 //! Sample from a truncated distribution 0019 template<class Distribution> 0020 struct TruncatedDistribution 0021 { 0022 Distribution distribution{}; 0023 double lower{-numeric_limits<double>::infinity()}; 0024 double upper{numeric_limits<double>::infinity()}; 0025 }; 0026 0027 //---------------------------------------------------------------------------// 0028 //! "Sample" the given value 0029 template<class T> 0030 struct DeltaDistribution 0031 { 0032 T value{}; 0033 }; 0034 0035 //---------------------------------------------------------------------------// 0036 //! Sample from a Gaussian (normal) distribution 0037 struct NormalDistribution 0038 { 0039 double mean{0}; 0040 double stddev{1}; 0041 }; 0042 0043 //---------------------------------------------------------------------------// 0044 //! Sample a point uniformly on the surface of a unit sphere 0045 struct IsotropicDistribution 0046 { 0047 }; 0048 0049 //---------------------------------------------------------------------------// 0050 //! Sample uniformly in a box 0051 struct UniformBoxDistribution 0052 { 0053 using Real3 = Array<double, 3>; 0054 0055 Real3 lower{0, 0, 0}; 0056 Real3 upper{0, 0, 0}; 0057 }; 0058 0059 //---------------------------------------------------------------------------// 0060 } // namespace inp 0061 } // namespace celeritas
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