matlab代码加载“lab1data.txt”文件，设置距离阈值为225米，在flooding路由协议中，每个传感器 节点都可以向其225米半径范围内的所有邻居发送数据包，旦所有节点收到数据包，数据包转发 立刻停止计算上述条件下所需的跳数

以下是 MATLAB 代码加载“lab1data.txt”文件，设置距离阈值为225米，在 flooding 路由协议中，每个传感器节点都可以向其225米半径范围内的所有邻居发送数据包，并计算所需的跳数：

% Load data from file
data = load('lab1data.txt');

% Set distance threshold
threshold = 225;

% Initialize variables
num_nodes = size(data, 1);
distances = zeros(num_nodes, num_nodes);
hops = zeros(num_nodes, num_nodes);

% Calculate distances between nodes
for i = 1:num_nodes
    for j = 1:num_nodes
        if i == j
            distances(i, j) = 0;
        else
            distances(i, j) = norm(data(i,:) - data(j,:));
        end
    end
end

% Calculate hops between nodes using flooding protocol
for i = 1:num_nodes
    for j = 1:num_nodes
        if distances(i, j) <= threshold
            hops(i, j) = 1;
        end
    end
end

% Calculate shortest path between nodes using Dijkstra's algorithm
for k = 1:num_nodes
    for i = 1:num_nodes
        for j = 1:num_nodes
            if hops(i, k) && hops(k, j)
                if hops(i, j) == 0 || hops(i, j) > hops(i, k) + hops(k, j)
                    hops(i, j) = hops(i, k) + hops(k, j);
                end
            end
        end
    end
end

% Calculate number of hops for each node to reach all other nodes
for i = 1:num_nodes
    hops(i, i) = 0;
    hops(i, isnan(hops(i,:))) = Inf;
    hops(i, hops(i,:) == 0) = Inf;
    hops(i, hops(i,:) == 1) = 1;
    hops(i, hops(i,:) > 1) = min(hops(i,hops(i,:) > 1));
end

% Display results
disp(hops);