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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;
void dynamic_reshape_all_size(int row, int col) {
// create matrix(row, col) and filled with 0, 1, 2, ...
Eigen::MatrixXi m(row, col);
for(int r = 0; r < row; ++r)
for(int c = 0; c < col; ++c)
m(r, c) = col * c + r;
// for all possible shape
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.
void static_reshape_all_size() {
// create matrix(row, col) and filled with 0, 1, 2, ...
int row = 4;
int col = 4;
Eigen::MatrixXi m(row, col);
for(int r = 0; r < row; ++r)
for(int c = 0; c < col; ++c)
m(r, c) = col * c + r;
// reshape and compare
VERIFY_IS_EQUAL((m.reshape< 1, 16>()), Map<MatrixXi>(m.data(), 1, 16));
VERIFY_IS_EQUAL((m.reshape< 2, 8>()), Map<MatrixXi>(m.data(), 2, 8));
VERIFY_IS_EQUAL((m.reshape< 4, 4>()), Map<MatrixXi>(m.data(), 4, 4));
VERIFY_IS_EQUAL((m.reshape< 8, 2>()), Map<MatrixXi>(m.data(), 8, 2));
VERIFY_IS_EQUAL((m.reshape<16, 1>()), Map<MatrixXi>(m.data(), 16, 1));
}
void test_reshape()
{
CALL_SUBTEST(dynamic_reshape_all_size(4, 4));
CALL_SUBTEST(static_reshape_all_size());
}
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