Question about ismember function

I created a variable that stores a set of numbers for an arc (a,b). Sc{1,2} = [1,2]; Sc{2,1} = [1,2]; Sc{1,3} = [2]; Sc{3,1} = [2]; Sc{3,4} = [1,2]; Sc{4,3} = [1,2]; Sc{2,4} = [1]; Sc{4,2} = [1];

I would like to implement the following condition:

s{1} = [1,2];
for v = 1:n,               
             if s{v} is a subset of s{u}
             s{v} = intersect( s{u},Sc{u,v});
            end;
         end;

I dont know how to code 'if s{v} is a subset of s{u}' in matlab. please help I tried the ismember function:

   if(ismember(scenarios{v},scenarios {u}))

but it is showing the following error:

Index exceeds matrix dimensions

Answer 1

[Walter Roberson]

That error could arise if either u or v exceeded length(s) . You have not shown us how u is being controlled, and have not shown us the relationship between "n" and length(s) .

[jana]

u is the node with the shortest distance from the source.

I don't understand what you mean by the relationship between n and length(s). n is just the node number in this case it would be 4.

[jana]

This is how u is defined:

for i = 1:(n-1),
      temp = [];
      for h = 1:n,
           if ~visited(h)  % in the tree;
               temp=[temp distance(h)];
           else
               temp=[temp inf];
           end
       end;
       [t, u] = min(temp);      % it starts from node with the shortest distance to the source;
       visited(u) = true;         % mark it as visited;

[Walter Roberson]

At the MATLAB command line give the command

dbstop if error

then run your program. When it stops with the error message, examine the values of u, and v, and size(scenarios) . Also give the command

which ismember

just in case "ismember" got overwritten as a function.