将3D Matlab矩阵以1D形式写入文件，然后用C++读回

matrix = reshape(matrix, 1, []);

fid = fopen('filename', 'w');
fwrite(fid, matrix, 'double');
fclose(fid);

#include <iostream>
#include <fstream>
#include <vector>

int main() {
    std::ifstream file("filename", std::ios::binary);
    if (file) {
        // 获取文件大小
        file.seekg(0, std::ios::end);
        std::streampos fileSize = file.tellg();
        file.seekg(0, std::ios::beg);

        // 读取文件内容到vector
        std::vector<double> data(fileSize / sizeof(double));
        file.read(reinterpret_cast<char*>(data.data()), fileSize);

        // 还原1D数组为3D矩阵
        int dim1 = 3;  // 第一维大小
        int dim2 = 4;  // 第二维大小
        int dim3 = 5;  // 第三维大小
        std::vector<std::vector<std::vector<double>>> matrix(dim1, std::vector<std::vector<double>>(dim2, std::vector<double>(dim3)));
        int index = 0;
        for (int i = 0; i < dim1; i++) {
            for (int j = 0; j < dim2; j++) {
                for (int k = 0; k < dim3; k++) {
                    matrix[i][j][k] = data[index++];
                }
            }
        }

        // 输出还原后的矩阵
        for (int i = 0; i < dim1; i++) {
            for (int j = 0; j < dim2; j++) {
                for (int k = 0; k < dim3; k++) {
                    std::cout << matrix[i][j][k] << " ";
                }
                std::cout << std::endl;
            }
            std::cout << std::endl;
        }
    }
    return 0;
}