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1 | // This file is part of Bembel, the higher order C++ boundary element library. | ||
2 | // | ||
3 | // Copyright (C) 2022 see <http://www.bembel.eu> | ||
4 | // | ||
5 | // It was written as part of a cooperation of J. Doelz, H. Harbrecht, S. Kurz, | ||
6 | // M. Multerer, S. Schoeps, and F. Wolf at Technische Universitaet Darmstadt, | ||
7 | // Universitaet Basel, and Universita della Svizzera italiana, Lugano. This | ||
8 | // source code is subject to the GNU General Public License version 3 and | ||
9 | // provided WITHOUT ANY WARRANTY, see <http://www.bembel.eu> for further | ||
10 | // information. | ||
11 | #ifndef BEMBEL_SRC_SPLINE_UNROLL_HPP_ | ||
12 | #define BEMBEL_SRC_SPLINE_UNROLL_HPP_ | ||
13 | |||
14 | namespace Bembel { | ||
15 | namespace Spl { | ||
16 | |||
17 | /** | ||
18 | * \brief Tiny helper functions. | ||
19 | */ | ||
20 | |||
21 | // Unrolls a matrix into a vector. Y-Dir first. | ||
22 | template <typename T> | ||
23 | 369 | inline Eigen::Matrix<T, -1, 1> Unroll( | |
24 | const Eigen::Matrix<T, -1, -1> &input_matrix) noexcept { | ||
25 | 369 | const int nx = input_matrix.cols(); | |
26 | 369 | const int ny = input_matrix.rows(); | |
27 | // std::cout << "unroll\n"; | ||
28 | 369 | Eigen::Matrix<T, -1, 1> out(nx * ny, 1); | |
29 |
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1705 | for (int i = 0; i < nx; i++) { |
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7012 | for (int j = 0; j < ny; j++) out(i * ny + j) = input_matrix(j, i); |
31 | } | ||
32 | 369 | return out; | |
33 | } | ||
34 | } // namespace Spl | ||
35 | } // namespace Bembel | ||
36 | #endif // BEMBEL_SRC_SPLINE_UNROLL_HPP_ | ||
37 |