could anyone tell me how to find the values of N_rng to have all possible combinations

code:
N_UE=[4 6];
N_rng=[1 2 3 4 5 6 7 8 9 10]
for t=1:length(N_UE)
for s=1:length(N_rng)
this_seed = N_rng(s);
fprintf('Below results are for rng = %d\n', this_seed)
rng(this_seed);
unused_rows=1:N_UE(t);
while ~isempty(unused_rows)
N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));
if (N_UE_rows+1)==numel(unused_rows)
N_UE_rows=numel(unused_rows);
end
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
[~,idx]=find(ismember(unused_rows,rows));
unused_rows(idx)=[];
end
end
end

for the above code how to find the values of N_rng inorder to have all possible combinations of 4 and 6

[Guillaume]

What is all possible combinations of 4 and 6? The set { {}, {4}, {6}, {4 6}}? something else?

Your code is very strange and has no comment that explains at all what it is doing.

If like in a previous question, you're trying to find a given seed that produces a specific random sequence, then you're wasting your time.

My feeling: you have absolutely no idea what you're doing and do not even understand how random number generators work. I suggest you spend more time learning about the functions you're using rather than asking many meangingless questions.

Note:

[~,idx]=find(ismember(unused_rows,rows));

is written more simply as:

[~, idx] = ismember(unused_rows, rows)

but considering that most of the code above that makes zero sense that's probably the least of your concern.

[Jan]

"All possible combinations of 4 and 6" is not unique: With or without order? With or without repetitions? There are much more efficient methods to get a list of combinations. So please explain clearly, what you want to achieve.

[Stephan]

See flag - same question for the third time...

[jaah navi]

If no of users=6(1,2,3,4,5,6) they should have all the possible combinations such as (14,25,3,6),(26,15,43),(3,26,135),(341,265),(1,2,3,4,56),(2,3,4,156),(12345,6),(1234,56),(1234,5,6),(1,2,3,4,5,6).Is there any other possible way to find the combinations.

[Jan]

@jaah navi: Please explain the problem exactly. It is not the job of the forum to guess, what you want. It is not even clear what "(14,25,3,6)" means, because this is no valid Matlab syntax.

It is a very strange approach to use different seeds to get a full set a combinations. There could be trillions of possible combinations, so constructing them randomly and hoping to catch all is surely the wrong approach. Therefore "find the values of N_rng" will not be useful.

[the cyclist]

@jaah navi: I agree completely with Jan. Here is a specific suggestion. Suppose the input were

n_users = 3;

Tell us exactly what the output should be, using valid MATLAB syntax. Maybe then we can figure out what the algorithm is for larger number of users.

[jaah navi]

if n_users = 3;
code:
N_rng=[1 2 5 10]
for s=1:length(N_rng)
this_seed = N_rng(s);
fprintf('Below results are for rng = %d\n', this_seed)
rng(this_seed);
unused_rows=1:3;
while ~isempty(unused_rows)
N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
[~,idx]=find(ismember(unused_rows,rows));
unused_rows(idx)=[];
end
end

If i run the code i am getting the following result

N_rng =

       1     2     5    10

Below results are for rng = 1

rows =

       2     3

rows =

       1

Below results are for rng = 2

rows =

       1     3

rows =

       2

Below results are for rng = 5

rows =

     2

rows =

       1

rows =

       3

Below results are for rng = 10

rows =

       1     2

rows =

       3
  this is with respect to n_users=3.In the same way 
i need to find n_users =6.what values of rng can be used to find it.could you please help me on this.

[Guillaume]

As stated in the other identical question, if you want a specific sequence then don't use a random generator.

You have yet to explained why you are using random number generators but then want to constrain that generator to generate a specific number that creates a given output.

Frankly, you're wasting everyone time because we can't see the logic behind what you're doing.

At the end of the day, if you're hell bent on finding a seed that gives you a specific sequence, feel free to try them all yourself. You don't need our help for that, you just need a lot of time. Mathworks does not document if the default random number generator is 32 or 64 bits, you only need to test 4,294,967,296 different values if 32 bits and 18,446,744,073,709,551,616 different values if 64 bits. Of course, given the weirdness of your code there is no guarantee that any of these values will generate your desired sequence.

Now maybe if instead of using flawed code and flawed algorithm you explained better what this is all about, we could help.

[Dennis]

Maybe you could explain why you want to use randi.

If you are just looking for all possible combinations of numbers from 1:n i recommend you try out perms(1:n).

If you actually need seeds that generate specific results you can use Walter Robersons' code he provided you in another thread.

https://de.mathworks.com/matlabcentral/answers/398134-could-anyone-help-me-to-fix-the-issue