46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/*
|
|
* <Short Description>
|
|
* Copyright (C) 2024 Brett Terpstra
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <assign3/functions.h>
|
|
#include <cmath>
|
|
#include "blt/iterator/zip.h"
|
|
|
|
namespace assign3
|
|
{
|
|
|
|
Scalar gaussian_function_t::call(Scalar dist, Scalar r) const
|
|
{
|
|
auto dist_sq = dist * dist;
|
|
return std::exp(-r * dist_sq);
|
|
}
|
|
|
|
Scalar gaussian_function_t::scale(Scalar half_distance, Scalar target_strength) const
|
|
{
|
|
return -std::log(target_strength) / (half_distance * half_distance);
|
|
}
|
|
|
|
Scalar euclidean_distance_function_t::distance(blt::span<const Scalar> x, blt::span<const Scalar> y) const
|
|
{
|
|
Scalar dist = 0;
|
|
for (auto [a, b] : blt::in_pairs(x, y))
|
|
{
|
|
auto d = a - b;
|
|
dist += d * d;
|
|
}
|
|
return std::sqrt(dist);
|
|
}
|
|
} |