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。