Could anyone tell me how to execute the following code

N_UE=[2 4 6 8 10];
for t= 1:length(N_UE)
numGroups = 5; 
divisions = sort(randperm(t, numGroups) , 'ascend')
divisions = [0, divisions, t]
% Create cell array with random number of users in each groups
groups = cell(1, numGroups);
for k = 1 : numGroups
  indexes = divisions(k)+1:divisions(k+1);
  % Assign users to the kth group:
  usersInThisGroups = length(indexes);
  fprintf('Assigning %d users (indexes %d to %d) to group %d.\n', ...
    usersInThisGroups, divisions(k)+1,divisions(k+1), k);
  groups{k} = t(indexes);
end
celldisp(groups); 
end

If i run the above code i am getting Error using randperm K must be less than or equal to N.

Error in check (line 10) divisions = sort(randperm(t, numGroups) , 'ascend')

Please help me to fix this issue.

Answer 1

[ANKUR KUMAR]

You problem of Error using randperm K must be less than or equal to N can be resolved by changing

divisions = sort(randperm(t, numGroups) , 'ascend')

to

divisions = sort(randperm( numGroups,t) , 'ascend')

After omitting this error, one more error is there in this line.

groups{k} = t(indexes);

In your program, t is the loop call variable, and at a time, t stores only one value. At the same time, indexes is of dimension 1*5. How can be expect from matlab to extract 1*5 location (which are there is indexes) from one number variable( t).

Could you please explain your motive behind using this line, so that we can help you completely to resolve your problem.

[Prabha Kumaresan]

The intention of this code is to group users in a random manner and display the index of the users present in each group.

Answer 2

[Rik]

Read the error message and the documentation. What is supposed to happen when you have only 2 values and you ask Matlab to pick 5? The following line will let you run the code, but might not be what you mean.

divisions = sort(randperm(t,min([t numGroups])) , 'ascend')

Alternatively, you can start the loop at numGroups.

for t= numGroups:length(N_UE)

[Prabha Kumaresan]

But still i am getting error after doing the changes which you have mentioned.
the following error exists:
Attempted to access t(2); index out of bounds because
numel(t)=1.

[ANKUR KUMAR]

It is understood that, " Attempted to access t(2); index out of bounds because numel(t)=1."

numel(t)=1 and you are trying to take out the second element from t. As you are trying for t(2). It's not logical to extract t(2) when t is of dimension 1*1.

[Prabha Kumaresan]

Then how it can be resolved.

[Rik]

t is only a scalar. It does not contain a list of users, so you can get the user values by indexing it.

[Prabha Kumaresan]

Could you tell me how to get the user values by indexing it.