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70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2014 yoco <peter.xiau@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#include "main.h"
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using Eigen::Map;
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using Eigen::MatrixXi;
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template <typename MatType>
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void dynamic_reshape_all_size(MatType m, int row, int col) {
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for(int new_r = 1; new_r <= row * col; ++new_r) {
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// skip invalid shape
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if(row * col % new_r != 0)
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continue;
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// reshape and compare
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int new_c = row * col / new_r;
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VERIFY_IS_EQUAL(m.reshape(new_r, new_c),
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Map<MatrixXi>(m.data(), new_r, new_c));
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}
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}
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// just test a 4x4 matrix, enumerate all combination manually,
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// so I don't have to do template-meta-programming here.
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template <typename MatType>
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void static_reshape_all_size(MatType m) {
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VERIFY_IS_EQUAL((m.template reshape< 1, 16>()), Map<MatrixXi>(m.data(), 1, 16));
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VERIFY_IS_EQUAL((m.template reshape< 2, 8>()), Map<MatrixXi>(m.data(), 2, 8));
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VERIFY_IS_EQUAL((m.template reshape< 4, 4>()), Map<MatrixXi>(m.data(), 4, 4));
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VERIFY_IS_EQUAL((m.template reshape< 8, 2>()), Map<MatrixXi>(m.data(), 8, 2));
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VERIFY_IS_EQUAL((m.template reshape<16, 1>()), Map<MatrixXi>(m.data(), 16, 1));
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}
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void test_reshape()
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{
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// create matrix(row, col) and filled with 0, 1, 2, ...
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// for all possible shape
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int row = 4;
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int col = 4;
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Eigen::MatrixXi mx(row, col);
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Eigen::Matrix4i m4(row, col);
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for(int r = 0; r < row; ++r) {
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for(int c = 0; c < col; ++c) {
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mx(r, c) = col * c + r;
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m4(r, c) = col * c + r;
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}
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}
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// test dynamic-size matrix
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CALL_SUBTEST(dynamic_reshape_all_size(mx, 4, 4));
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CALL_SUBTEST(static_reshape_all_size(mx));
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// test static-size matrix
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CALL_SUBTEST(dynamic_reshape_all_size(m4, 4, 4));
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CALL_SUBTEST(static_reshape_all_size(m4));
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// test dynamic-size const matrix
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CALL_SUBTEST(dynamic_reshape_all_size(static_cast<const Eigen::MatrixXi>(mx), 4, 4));
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CALL_SUBTEST(static_reshape_all_size(static_cast<const Eigen::MatrixXi>(mx)));
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// test static-size const matrix
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CALL_SUBTEST(dynamic_reshape_all_size(static_cast<const Eigen::Matrix4i>(m4), 4, 4));
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CALL_SUBTEST(static_reshape_all_size(static_cast<const Eigen::Matrix4i>(m4)));
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}
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