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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 yoco <peter.xiau@gmail.com>
//
// 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/.
#include "main.h"
using Eigen::Map;
using Eigen::MatrixXi;
template <typename MatType>
void dynamic_reshape_all_size(MatType m, int row, int col) {
for(int new_r = 1; new_r <= row * col; ++new_r) {
// skip invalid shape
if(row * col % new_r != 0)
continue;
// reshape and compare
int new_c = row * col / new_r;
VERIFY_IS_EQUAL(m.reshape(new_r, new_c),
Map<MatrixXi>(m.data(), new_r, new_c));
}
}
// just test a 4x4 matrix, enumerate all combination manually,
// so I don't have to do template-meta-programming here.
template <typename MatType>
void static_reshape_all_size(MatType m) {
VERIFY_IS_EQUAL((m.template reshape< 1, 16>()), Map<MatrixXi>(m.data(), 1, 16));
VERIFY_IS_EQUAL((m.template reshape< 2, 8>()), Map<MatrixXi>(m.data(), 2, 8));
VERIFY_IS_EQUAL((m.template reshape< 4, 4>()), Map<MatrixXi>(m.data(), 4, 4));
VERIFY_IS_EQUAL((m.template reshape< 8, 2>()), Map<MatrixXi>(m.data(), 8, 2));
VERIFY_IS_EQUAL((m.template reshape<16, 1>()), Map<MatrixXi>(m.data(), 16, 1));
}
void test_reshape()
{
// create matrix(row, col) and filled with 0, 1, 2, ...
// for all possible shape
int row = 4;
int col = 4;
Eigen::MatrixXi mx(row, col);
Eigen::Matrix4i m4(row, col);
for(int r = 0; r < row; ++r) {
for(int c = 0; c < col; ++c) {
mx(r, c) = col * c + r;
m4(r, c) = col * c + r;
}
}
mx.reshape(8, 2).leftCols(2);
// test dynamic-size matrix
CALL_SUBTEST(dynamic_reshape_all_size(mx, 4, 4));
CALL_SUBTEST(static_reshape_all_size(mx));
// test static-size matrix
CALL_SUBTEST(dynamic_reshape_all_size(m4, 4, 4));
CALL_SUBTEST(static_reshape_all_size(m4));
// test dynamic-size const matrix
CALL_SUBTEST(dynamic_reshape_all_size(static_cast<const Eigen::MatrixXi>(mx), 4, 4));
CALL_SUBTEST(static_reshape_all_size(static_cast<const Eigen::MatrixXi>(mx)));
// test static-size const matrix
CALL_SUBTEST(dynamic_reshape_all_size(static_cast<const Eigen::Matrix4i>(m4), 4, 4));
CALL_SUBTEST(static_reshape_all_size(static_cast<const Eigen::Matrix4i>(m4)));
}
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