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

位置 2 的索引无效。数组索引必须为正整数或逻辑值。 出错 oooo (line 751) if ismember(i, gateway1) && sum(a1(i, gateway1) == 3) > n_gateway/2+1file = 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 修改为正确代码

这个错误信息说明了在代码中使用了一个无效的索引位置2。具体来说，可能是在a1(i, gateway1)这一行代码中，i取值为2，但是gateway1数组的长度小于2，导致出现了这个错误。你需要检查一下gateway1数组的长度是否正确，或者在使用这个数组之前先进行长度判断和处理。以下是修改后的代码：

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));
if n_gateway > 0
    idx = randperm(size(gateway1, 1), n_gateway);
    gateway1 = gateway1(idx, :);
    gateway2 = gateway2(idx, :);
end

state1 = zeros(n1, 1); % 第一层节点状态
state2 = zeros(n2, 1); % 第二层节点状态

这里加了一个判断，如果n_gateway为0，则不进行随机选择网关的操作。

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 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 gateway1和2中有些节点坐标是重复的，因为第一层一个节点可能与另一层两个节点有连接边，所以在提取网关节点时该怎么修改代码

可以在提取网关节点时，使用unique函数对gateway1和gateway2进行去重操作，保证每个节点只出现一次。修改后的代码如下：

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