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/* Copyright (c) 2008-2025 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Covered Software is provided under this License on an "as is"
* basis, without warranty of any kind, either expressed, implied, or
* statutory, including, without limitation, warranties that the
* Covered Software is free of defects, merchantable, fit for a
* particular purpose or non-infringing.
* See the Mozilla Public License v. 2.0 for more details.
*
* For more details, see http://www.mrtrix.org/.
*/
#include <sstream>
#include "command.h"
#include "math/SH.h"
using namespace MR;
using namespace App;
void usage ()
{
AUTHOR = "J-Donald Tournier (jdtournier@gmail.com)";
SYNOPSIS = "Test the accuracy of the spherical harmonic precomputer";
REQUIRES_AT_LEAST_ONE_ARGUMENT = false;
}
using value_type = float;
using coefs_type = Eigen::Matrix<value_type,Eigen::Dynamic,1>;
using dir_type = Eigen::Matrix<value_type,3,1>;
void run ()
{
using namespace Math::SH;
const int lmax = 8;
coefs_type coefs = coefs_type::Random (NforL (lmax));
PrecomputedAL<value_type> precomputer (lmax);
for (size_t n = 0; n < 10000; ++n) {
dir_type direction = dir_type::Random().normalized();
if (std::abs (value (coefs, direction, lmax) - precomputer.value (coefs, direction)) > 1e-3)
throw Exception ("difference exceeds tolerance");
}
}
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