如何读取该文件中的节点数量，并记为n_gateway。file = fopen('liangcengjiedian.txt', 'r'); % 去掉空格 if file ~= -1 % 确认文件已经被正确打开 data = textscan(file, '(%f,%f,%f) to (%f,%f,%f)\n'); gateway1 = []; gateway2 = []; for i = 1:size(data{1}, 1) x1 = data{1}(i); y1 = data{2}(i); z1 = data{3}(i); x2 = data{4}(i); y2 = data{5}(i); z2 = data{6}(i); gateway1 = [gateway1; x1, y1, z1]; gateway2 = [gateway2; x2, y2, z2]; end fclose(file); % 记得关闭文件 else

可以使用MATLAB中的函数textscan读取文件中的节点数量并存储在变量n_gateway中。具体代码如下：

file = fopen('liangcengjiedian.txt', 'r');
if file ~= -1
    data = textscan(file, '(%f,%f,%f) to (%f,%f,%f)\n');
    n_gateway = length(data{1});
    gateway1 = [];
    gateway2 = [];
    for i = 1:size(data{1}, 1)
        x1 = data{1}(i);
        y1 = data{2}(i);
        z1 = data{3}(i);
        x2 = data{4}(i);
        y2 = data{5}(i);
        z2 = data{6}(i);
        gateway1 = [gateway1; x1, y1, z1];
        gateway2 = [gateway2; x2, y2, z2];
    end
    fclose(file);
else
    fprintf('Failed to open file\n');
end

其中，函数length用于获取data{1}中的元素个数，即节点数量。

相关问题

% 设置参数 % 计算每个节点的度数 degree = sum(a1~=0, 2); % 节点以概率i/N*0.1退化，i为节点度数 prob = degree./(N*10); p_failure = 0.01; % 正常节点失效的概率 p_fault = 0.1; % 节点故障的概率 t_repair = 100; % 故障节点失效前修复的时间步长 t_degrade = 20; % 退化节点失效前进入失效状态的时间步长 n_gateway = 10; % 网关节点数量 % 生成随机网络结构和节点状态 n1=20; n2=20; file = fopen('liangcengjiedian.txt', 'r'); % 去掉空格 if file ~= -1 % 确认文件已经被正确打开 data = textscan(file, '(%f,%f,%f) to (%f,%f,%f)\n'); n_gateway = length(data{1}); gateway1 = []; gateway2 = []; for i = 1:size(data{1}, 1) x1 = data{1}(i); y1 = data{2}(i); z1 = data{3}(i); x2 = data{4}(i); y2 = data{5}(i); z2 = data{6}(i); gateway1 = [gateway1; x1, y1, z1]; gateway2 = [gateway2; x2, y2, z2]; end fclose(file); % 记得关闭文件 else disp('Error: file not found or could not be opened.'); end % 使用randperm函数随机选择n_gateway个网关 n_gateway = min(n_gateway, size(gateway1, 1)); idx = randperm(size(gateway1, 1), n_gateway); gateway1 = gateway1(idx, :); gateway2 = gateway2(idx, :); state1 = zeros(n1, 1); % 第一层节点状态 state2 = zeros(n2, 1); % 第二层节点状态修改代码

borrows[borrow_count].book_id = book_id;
borrows[borrow_count].borrow_id = borrow_count + 1;
borrow_count++;
printf("Borrow book successfully.\n");
return;
}
}
printf("Book not found.\根据代码段，似乎没有要求修改的问题。不过，可以对代码进行一些改进，以提高n");
}

void return_book() {
int book_id, i;
char actual_return_date[20];
printf("Please input the book id to return: ");
scanf("%d", &book_id);
for (i = 0; i < book_count; i代码的可读性和可维护性。

1. 统一变量命名方式，建议使用下划线分隔++) {
if (books[i].book_id == book_id) {
if (books[i].status == 0) {
printf单词，例如 `p_failure` 改为 `p_failure_rate`，`t_repair` 改为 `t_repair_step`("The book is not borrowed.\n");
return;
}
printf("Please input the actual return date: ");
scanf("%s", actual_return_date);
books[i].status = 0;
strcpy(borrows[i].actual_return_date, actual_return。

2. 使用结构体或对象封装参数，以便统一管理和传递参数。例如：

params.degree_date);
            printf("Return book successfully.\n");
            return;
        }
    }
    printf("Book not found.\n");
}

 = sum(a1~=0, 2);
params.prob = params.degree./(N*10);
params.p_failure_rate = 0.01void query_borrow() {
    int i;
    char user_name[20];
    printf("Please input your name to query borrow record:;
params.p_fault_rate = 0.1;
params.t_repair_step = 100;
params.t_degrade_step = 20;
 ");
    scanf("%s", user_name);
    printf("Your borrow record:\n");
    for (i = 0; i < borrowparams.n_gateway = 10;

3. 将读取文件的代码封装成一个函数，以便重复使用。_count; i++) {
if (strcmp(borrows[i].user_name, user_name) == 0) {
printf("B例如：

function [gateway1, gateway2, n_gateway] = read_gateway_file(filename)
    file = fopen(filename, 'rorrow id: %d\n", borrows[i].borrow_id);
            printf("Book id: %d\n", borrows[i].book_id);
            printf("Borrow date: %s\n", borrows[i].borrow_date);
            printf("Return date: %s\n');
    if file ~= -1
        data = textscan(file, '(%f,%f,%f) to (%f,%f,%", borrows[i].return_date);
            printf("Actual return date: %s\n", borrows[i].actual_return_date);
           f)\n');
        n_gateway = length(data{1});
        gateway1 = [];
        gateway2 = [];
        for i = 1 printf("\n");
        }
    }
}

int main() {
    int choice;
    while (1) {
        printf("Please select:size(data{1}, 1)
            x1 = data{1}(i);
            y1 = data{2}(i);
            the operation:\n");
        printf("1. Add book\n");
        printf("2. Delete book\n");
        printf("3. Modify book\n");
        printf("4. Query book\n");
        printf("5. Add category\n");
        printf("6. Delete z1 = data{3}(i);
            x2 = data{4}(i);
            y2 = data{5}(i);
 category\n");
        printf("7. Modify category\n");
        printf("8. Query category\n");
        printf("9. Borrow book            z2 = data{6}(i);
            gateway1 = [gateway1; x1, y1, z1];
            gateway\n");
        printf("10. Return book\n");
        printf("11. Query borrow record\n");
        printf("0. Exit\n2 = [gateway2; x2, y2, z2];
        end
        fclose(file);
    else
        error('Error");
        printf("Your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_book();
                break;
            case 

n1=20; n2=20; file = fopen('liangcengjiedian.txt', 'r'); if file ~= -1 n_gateway = 0; gateway1 = []; gateway2 = []; while ~feof(file) line = fgetl(file); if ~isempty(line) data = sscanf(line, '(%f,%f,%f) to (%f,%f,%f)'); if length(data) == 6 n_gateway = n_gateway + 1; x1 = data(1); y1 = data(2); z1 = data(3); x2 = data(4); y2 = data(5); z2 = data(6); gateway1 = [gateway1; x1, y1, z1]; gateway2 = [gateway2; x2, y2, z2]; end end end fclose(file); else disp('Error: file not found or could not be opened.'); end % 对gateway1和gateway2进行去重操作 [gateway1, ia1] = unique(gateway1, 'rows'); gateway2 = gateway2(ia1, :); [gateway2, ia2] = unique(gateway2, 'rows'); gateway1 = gateway1(ia2, :); disp(gateway1); disp(gateway2); % 使用randperm函数随机选择n_gateway个网关 n_gateway = min(n_gateway, size(gateway1, 1)); if n_gateway > 0 idx = randperm(size(gateway1, 1), n_gateway); gateway1 = gateway1(idx, :); gateway2 = gateway2(idx, :); end两层网络的网关节点数量不一样，该怎么修改呢

可以在代码中添加一个变量来控制每层网络的网关节点数量，比如分别定义n_gateway1和n_gateway2来表示两层网络的网关节点数量，然后根据这两个变量来进行随机选择网关节点的操作。具体修改如下：

n1 = 20;
n2 = 20;
file = fopen('liangcengjiedian.txt', 'r');
if file ~= -1
    n_gateway1 = 0;
    n_gateway2 = 0;
    gateway1 = [];
    gateway2 = [];
    while ~feof(file)
        line = fgetl(file);
        if ~isempty(line)
            data = sscanf(line, '(%f,%f,%f) to (%f,%f,%f)');
            if length(data) == 6
                if n_gateway1 < n1
                    n_gateway1 = n_gateway1 + 1;
                    x1 = data(1);
                    y1 = data(2);
                    z1 = data(3);
                    gateway1 = [gateway1; x1, y1, z1];
                elseif n_gateway2 < n2
                    n_gateway2 = n_gateway2 + 1;
                    x2 = data(4);
                    y2 = data(5);
                    z2 = data(6);
                    gateway2 = [gateway2; x2, y2, z2];
                end
            end
        end
    end
    fclose(file);
else
    disp('Error: file not found or could not be opened.');
end

% 对gateway1和gateway2进行去重操作
[gateway1, ia1] = unique(gateway1, 'rows');
gateway2 = gateway2(ia1, :);

[gateway2, ia2] = unique(gateway2, 'rows');
gateway1 = gateway1(ia2, :);

disp(gateway1);
disp(gateway2);

% 随机选择n_gateway1个网关节点作为第一层网络的网关节点
n_gateway1 = min(n_gateway1, size(gateway1, 1));
if n_gateway1 > 0
    idx1 = randperm(size(gateway1, 1), n_gateway1);
    gateway1 = gateway1(idx1, :);
end

% 随机选择n_gateway2个网关节点作为第二层网络的网关节点
n_gateway2 = min(n_gateway2, size(gateway2, 1));
if n_gateway2 > 0
    idx2 = randperm(size(gateway2, 1), n_gateway2);
    gateway2 = gateway2(idx2, :);
end

在修改后的代码中，我们添加了两个变量n_gateway1和n_gateway2来表示两层网络的网关节点数量，然后在读取文件时，根据当前层的网关节点数量是否达到设定的数量n1和n2来决定将读取到的网关节点加入第一层网络还是第二层网络。在随机选择网关节点时，分别根据n_gateway1和n_gateway2来进行操作。