if r ~= c || r <= 1 ERROR = 1; end
时间: 2023-11-01 14:58:20 浏览: 34
这段代码的作用是判断变量 `r` 是否不等于 `c` 或者 `r` 是否小于等于 1。如果满足其中任一条件,将错误码 `ERROR` 设置为 1。
需要注意的是,你提供的代码中存在一个语法错误。在 MATLAB 中,`if` 语句的条件表达式后面需要以 `end` 结束,而不是以分号结尾。下面是修正后的代码:
```matlab
if r ~= c || r <= 1
ERROR = 1;
end
```
在运行时,如果 `r` 不等于 `c` 或者 `r` 小于等于 1,那么变量 `ERROR` 将被设置为 1。否则,不会执行任何操作。
希望能够解答你的问题!如果还有其他疑问,请随时提问。
相关问题
修改一下该代码中的错误function [s1, s2] = repair_roads(data_file, pos_sheet, road_sheet, centers) % 检查输入参数是否合法 if nargin < 4 error('输入参数不足!'); end % 读取数据 position = xlsread(data_file, pos_sheet); roads = xlsread(data_file, road_sheet); % 计算各村庄之间的距离 n = size(position, 1); dist = pdist2(position, position); % 构建边集合 edges = []; for i = 1:n for j = i+1:n if roads[i,j] == 1 edges = [edges; i j dist(i,j)]; end end end % Kruskal算法求解最小生成树 edges = sortrows(edges, 3); parent = (1:n)'; rank = ones(n, 1); mst = []; for i = 1:size(edges,1) u = edges(i,1); v = edges(i,2); w = edges(i,3); pu = find(parent==u); pv = find(parent==v); if pu ~= pv mst = [mst; u v w]; if rank(pu) < rank(pv) parent(pu) = pv; elseif rank(pu) > rank(pv) parent(pv) = pu; else parent(pu) = pv; rank(pv) = rank(pv) + 1; end end end % 计算总距离S1 s1 = sum(min(dist(:,centers), [], 2)); % 计算维修道路总里程S2 is_center = ismember(1:n, centers); s2 = sum(mst(is_center(mst(:,1)) | is_center(mst(:,2)), 3)); % 绘制图形 colors = ['r', 'g', 'b']; figure; hold on; for i = 1:size(mst,1) u = mst(i,1); v = mst(i,2); w = mst(i,3); plot([position(u,1) position(v,1)], [position(u,2) position(v,2)], 'k'); end for i = 1:length(centers) plot(position(centers(i),1), position(centers(i),2), 'o', 'MarkerFaceColor', colors(i)); end for i = 1:n d = dist(i,centers); [~,c] = min(d); plot([position(i,1) position(centers(c),1)], [position(i,2) position(centers(c),2)], colors(c)); end hold off; % 输出结果 disp(['总距离S1:' num2str(s1)]); disp(['维修道路总里程S2:' num2str(s2)]); end
function [s1, s2] = repair_roads(data_file, pos_sheet, road_sheet, centers)
% 检查输入参数是否合法
if nargin < 4
error('输入参数不足!');
end
% 读取数据
position = xlsread(data_file, pos_sheet);
roads = xlsread(data_file, road_sheet);
% 计算各村庄之间的距离
n = size(position, 1);
dist = pdist2(position, position);
% 构建边集合
edges = [];
for i = 1:n
for j = i+1:n
if roads(i,j) == 1
edges = [edges; i j dist(i,j)];
end
end
end
% Kruskal算法求解最小生成树
edges = sortrows(edges, 3);
parent = (1:n)';
rank = ones(n, 1);
mst = [];
for i = 1:size(edges,1)
u = edges(i,1);
v = edges(i,2);
w = edges(i,3);
pu = find(parent==u);
pv = find(parent==v);
if pu ~= pv
mst = [mst; u v w];
if rank(pu) < rank(pv)
parent(pu) = pv;
elseif rank(pu) > rank(pv)
parent(pv) = pu;
else
parent(pu) = pv;
rank(pv) = rank(pv) + 1;
end
end
end
% 计算总距离S1
s1 = sum(min(dist(:,centers), [], 2));
% 计算维修道路总里程S2
is_center = ismember(1:n, centers);
s2 = sum(mst(is_center(mst(:,1)) | is_center(mst(:,2)), 3));
% 绘制图形
colors = ['r', 'g', 'b'];
figure; hold on;
for i = 1:size(mst,1)
u = mst(i,1);
v = mst(i,2);
w = mst(i,3);
plot([position(u,1) position(v,1)], [position(u,2) position(v,2)], 'k');
end
for i = 1:length(centers)
plot(position(centers(i),1), position(centers(i),2), 'o', 'MarkerFaceColor', colors(i));
end
for i = 1:n
d = dist(i,centers);
[~,c] = min(d);
plot([position(i,1) position(centers(c),1)], [position(i,2) position(centers(c),2)], colors(c));
end
hold off;
% 输出结果
disp(['总距离S1:' num2str(s1)]);
disp(['维修道路总里程S2:' num2str(s2)]);
end
function m = csvread(filename, r, c, rng) %CSVREAD Read a comma separated value file. % M = CSVREAD('FILENAME') reads a comma separated value formatted file % FILENAME. The result is returned in M. The file can only contain % numeric values. % % M = CSVREAD('FILENAME',R,C) reads data from the comma separated value % formatted file starting at row R and column C. R and C are zero- % based so that R=0 and C=0 specifies the first value in the file. % % M = CSVREAD('FILENAME',R,C,RNG) reads only the range specified % by RNG = [R1 C1 R2 C2] where (R1,C1) is the upper-left corner of % the data to be read and (R2,C2) is the lower-right corner. RNG % can also be specified using spreadsheet notation as in RNG = 'A1..B7'. % % CSVREAD fills empty delimited fields with zero. Data files where % the lines end with a comma will produce a result with an extra last % column filled with zeros. % % See also CSVWRITE, DLMREAD, DLMWRITE, LOAD, TEXTSCAN. % Copyright 1984-2015 The MathWorks, Inc. % Validate input args narginchk(1,Inf); % Get Filename if ~matlab.internal.strfun.ischarlike(filename) error(message('MATLAB:csvread:FileNameMustBeString')); end filename = char(filename); % Make sure file exists if exist(filename,'file') ~= 2 error(message('MATLAB:csvread:FileNotFound')); end % % Call dlmread with a comma as the delimiter % if nargin < 2 r = 0; end if nargin < 3 c = 0; end if nargin < 4 m=dlmread(filename, ',', r, c); else m=dlmread(filename, ',', r, c, rng); end错误使用 csvread (line 35) 未找到文件。如何解决
这个错误提示是因为 csvread 函数找不到指定的文件。你需要确保文件名和文件路径是正确的,可以尝试以下方法来解决:
1. 检查文件名和路径是否正确,可以使用绝对路径或相对路径。
2. 确保文件存在,可以通过在命令行中使用 "exist" 函数来检查文件是否存在。
3. 确保文件没有被其他程序打开,如果文件正在使用中,可能会导致无法读取文件。
4. 确保文件没有被移动或删除,如果文件被移动或删除,可能会导致无法读取文件。
如果以上方法都无法解决问题,那么可能是其他的错误导致的。你可以尝试使用 "try-catch" 结构来捕获并处理错误,以便更好地调试和解决问题。