How to change the rng value

code:

unused_rows=1:6
while ~isempty(unused_rows)  
N_UE_rows=2;   
rng(3)
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
[~,idx]=find(ismember(unused_rows,rows))
unused_rows(idx)=[]
end

The above code works how to run the code by having different numbers of rng say for example rng(12),rng(2),rng(1).

[Steven Lord]

Prabha, you've asked this same question or a slight variation several times now. It's still not clear to me exactly what you're trying to do. Please take a short break from coding and write out IN WORDS NOT CODE a description of what you're trying to do. Explain it as though you were explaining it to someone who has no idea what problem you're trying to solve. That may help us understand your ultimate goal and allow us to suggest more effective solutions to that problem.

Answer 1

[Walter Roberson]

list_of_rng_seeds = [12, 2, 1];
rng_usage_idx = 0;

unused_rows = 1:6;
while ~isempty(unused_rows)
  N_UE_rows = 2;
  rng_usage_idx = mod(rng_usage_idx, length(list_of_rng_seeds)) + 1;
  rng(rng_usage_idx);
  rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
  [~,idx]=find(ismember(unused_rows,rows))
  unused_rows(idx)=[]
end

[Prabha Kumaresan]

but i can view the result for one rng value how to view the result for rng=2,rng=3,rng=12 .

[Prabha Kumaresan]

could you help me how to use the rng values in for loop so that for each run different values of rng can be used.

[Steven Lord]

Why are you resetting the random number generator in each iteration of your while loop? Are you doing so to compare the results that you receive from those specific seeds? Or are you doing so because you think that makes it "more random"? In the latter case, the recommendation is to NOT reset the generator.

[Prabha Kumaresan]

I want to compare the results that i receive from those specific seeds.

[Walter Roberson]

list_of_rng_seeds = [12, 2, 1];
num_rng = length(list_of_rng_seeds);

for rng_usage_idx = 1 : num_rng
  this_seed = list_of_rng_seeds(rng_usage_idx);
  fprintf('Below results are for rng = %d\n', this_seed);
  rng(this_seed);

    unused_rows = 1:6;
    while ~isempty(unused_rows)
      N_UE_rows = 2;
      rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
      [~,idx]=find(ismember(unused_rows,rows))
      unused_rows(idx)=[]
    end

end

[Prabha Kumaresan]

thanks now i can get the output for list of rng seeds. could you help me how to combine the rows of 12,2,1 separately,as i need to calculate the throughput value of 12,2,1.

[Walter Roberson]

Your code has no output as such. You overwrite all of your variables for each iteration of the loop. The only reason to execute your code is to display the results to the screen.

[Prabha Kumaresan]

I would like to check with you the following code

list_of_rng_seeds = [12, 2, 1];
  num_rng = length(list_of_rng_seeds);
  for rng_usage_idx = 1 : num_rng
    this_seed = list_of_rng_seeds(rng_usage_idx);
    fprintf('Below results are for rng = %d\n', this_seed);
    rng(this_seed);
      unused_rows = 1:6;
      while ~isempty(unused_rows)
        N_UE_rows = 2;
        rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
        [~,idx]=find(ismember(unused_rows,rows))
        unused_rows(idx)=[]
      end
  end

In the code the number of rows for each rng is getting fixed, say for example for rng=1 ,(34) and (12) form groups. I would like to check how to have variable numbers such that (3),(2),and (14) for rng.

[Walter Roberson]

I am not sure why you say that for rng 1, that (34) and (12) form groups? Did you mean (36) and (12) ? See below.

"I would like to check how to have variable numbers such that (3),(2),and (14) for rng"

I am not sure what you are asking, but I suspect what you are referring to is that the number of rows obtained at first is always 2. That is because you assigned N_UE_rows = 2 instead of determining the number of rows randomly. If I recall correctly, somewhere around your 171's question in Answers you were randomly determining the number of rows selected -- back then it was just a matter that the way you were selecting, it was lower probability that N_UE_rows would be well distributed.

Below results are for rng = 1

rows =

       3     6

idx =

       3     6

unused_rows =

       1     2     4     5

rows =

       1     2

idx =

       1     2

unused_rows =

       4     5

rows =

       4     5

idx =

       1     2

[Prabha Kumaresan]

sorry for troubling you.I made the mistake.

[Prabha Kumaresan]

i would like to check the following code:

list_of_rng_seeds = [12, 2, 1];
  num_rng = length(list_of_rng_seeds);
  for rng_usage_idx = 1 : num_rng
    this_seed = list_of_rng_seeds(rng_usage_idx);
    fprintf('Below results are for rng = %d\n', this_seed);
    rng(this_seed);
      unused_rows = 1:6;
      while ~isempty(unused_rows)
        N_UE_rows = 2;
        rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
        [~,idx]=find(ismember(unused_rows,rows))
        unused_rows(idx)=[]
      end
  end

could you please help me to run the above code with respect to different list_of_rng_seeds=[3 4 5 6 7],[8 9 10 11 12 13].

[Walter Roberson]

   lists_of_rng_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};

   for seed_idx = 1 : length(lists_of_rng_seeds)
     list_of_rng_seed = lists_of_rng_seeds{seed_idx};
   num_rng = length(list_of_rng_seeds);
  for rng_usage_idx = 1 : num_rng
    this_seed = list_of_rng_seeds(rng_usage_idx);
    fprintf('Below results are for rng = %d\n', this_seed);
    rng(this_seed);
      unused_rows = 1:6;
      while ~isempty(unused_rows)
        N_UE_rows = 2;
        rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
        [~,idx]=find(ismember(unused_rows,rows))
        unused_rows(idx)=[]
      end
  end
  end

[Prabha Kumaresan]

I am getting Error using fprintf Function is not defined for 'cell' inputs. Error in line fprintf('Below results are for rng = %d\n', this_seed);

Could you help me to overcome it.

[Walter Roberson]

   list_of_list_of_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};

   for seed_idx = 1 : length(list_of_list_of_seeds)
     list_of_rng_seeds = list_of_list_of_seeds{seed_idx};
     num_rng = length(list_of_rng_seeds);
     for rng_usage_idx = 1 : num_rng
       this_seed = list_of_rng_seeds(rng_usage_idx);
       fprintf('Below results are for rng = %d\n', this_seed);
       rng(this_seed);
       unused_rows = 1:6;
       while ~isempty(unused_rows)
         N_UE_rows = 2;
         rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
         [~,idx]=find(ismember(unused_rows,rows))
         unused_rows(idx)=[]
       end
     end
   end

[Prabha Kumaresan]

I also want to use include the command

N_UE_rows=ceil(sqrt(randi([2,numel(unused_rows)])));
N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));

in addition to

 N_UE_rows = 2;

such that [12, 2, 1] make use of

N_UE_rows = 2;

[3 4 5 6 7] need to use

N_UE_rows=ceil(sqrt(randi([2,numel(unused_rows)])));

and [8 9 10 11 12 13] need to use

N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));

could you please help me on this.

[Walter Roberson]

determine_N_UE_rows{1} = @(unused_rows) 2;
determine_N_UE_rows{2} = @(unused_rows) ceil(sqrt(randi([2,numel(unused_rows)])));
determine_N_UE_rows{3} = @(unused_rows) N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));

   list_of_list_of_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};

   for seed_idx = 1 : length(list_of_list_of_seeds)
     list_of_rng_seeds = list_of_list_of_seeds{seed_idx};
     N_UE_rows_fun = determine_N_UE_rows{seed_idx};
     num_rng = length(list_of_rng_seeds);
     for rng_usage_idx = 1 : num_rng
       this_seed = list_of_rng_seeds(rng_usage_idx);
       fprintf('Below results are for rng = %d\n', this_seed);
       rng(this_seed);
       unused_rows = 1:6;
       while ~isempty(unused_rows)
         N_UE_rows = N_UE_rows_fun(unused_rows);
         rows = unused_rows(randsample(length(unused_rows),N_UE_rows))
         [~,idx]=find(ismember(unused_rows,rows))
         unused_rows(idx)=[]
       end
     end
   end

[Prabha Kumaresan]

could you please help me to include list_of_list_of_seeds to calculate the throughput and run with different iterations with respect to the following command line

output1(t,r)=overall_throughput1;
  output1_it(t,r,it)=output1(t,r);
where t=6 and r=8.
I want to include list_of_list_of_seeds with respect to the above command line.
Could you please help me on this.

[Prabha Kumaresan]

Could you please help me how to calculate the throughput for [12, 2, 1],[3 4 5 6 7],[8 9 10 11 12 13] separately as i need to plot the graph for each throughput in one graph.

I tried with the code given to calculate the throughput followed by plotting the graph.

determine_N_UE_rows{1} = @(unused_rows) 2;
determine_N_UE_rows{2} = @(unused_rows) ceil(sqrt(randi([2,numel(unused_rows)])));
determine_N_UE_rows{3} = @(unused_rows) N_UE_rows=ceil(sqrt(randi([numel(unused_rows)])));
   list_of_list_of_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};
   for seed_idx = 1 : length(list_of_list_of_seeds)
     list_of_rng_seeds = list_of_list_of_seeds{seed_idx};
     N_UE_rows_fun = determine_N_UE_rows{seed_idx};
     num_rng = length(list_of_rng_seeds);
     for rng_usage_idx = 1 : num_rng
       this_seed = list_of_rng_seeds(rng_usage_idx);
       fprintf('Below results are for rng = %d\n', this_seed);
       rng(this_seed);
       unused_rows = 1:6;
       while ~isempty(unused_rows)
         N_UE_rows = N_UE_rows_fun(unused_rows);
         rows = unused_rows(randsample(length(unused_rows),N_UE_rows))
         [~,idx]=find(ismember(unused_rows,rows))
         unused_rows(idx)=[]
       end
     end
   end

throughput=........;
dummyX = 1:length(N_rng);
figure
plot(dummyX,y,'rs');
hold on;grid on;

But I am unable to get the throughput result separately.Could you please help me on this

[Walter Roberson]

Prabha Kumaresan, you have asked over 200 questions. You have had plenty of time to learn to understand the basics of for loops.

Go heavy into cell arrays if you need to. The first rule of programming is to get it to work first and only then worry about optimizing it.

[Prabha Kumaresan]

Ok.I have tried with the following code with respect to four iterations. output1(t,seed_idx,s,r)=overall_throughput1; output1_it(t,seed_idx,s,r,it)=output1(t,seed_idx,s,r); But the output1_it remains the same for all the iterations.Could you please help me on this.

[Prabha Kumaresan]

with respect to the code given i want to include some commands onto it.
N_UE=[4 6 8]
for t=1:length(N_UE)
list_of_list_of_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};
   for seed_idx = 1 : length(list_of_list_of_seeds)
     list_of_rng_seeds = list_of_list_of_seeds{seed_idx};
     num_rng = length(list_of_rng_seeds);
     for rng_usage_idx = 1 : num_rng
       this_seed = list_of_rng_seeds(rng_usage_idx);
       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 = 2;
         rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
         [~,idx]=find(ismember(unused_rows,rows))
         unused_rows(idx)=[]
       end
     end
   end
end

Could you please help me how to select when N_UE=4,list_of_list_of_seeds=[12,2,1] N_UE=6,list_of_list_of_seeds=[3,4,5,6,7] N_UE=8,list_of_list_of_seeds=[8,9,10,11,12,13]

[Walter Roberson]

To select seeds I would need to understand the desired outcome.

[Prabha Kumaresan]

ok. N_UE=4
the following results should be 
Below results are for rng = 12

rows =

       3

rows =

       1     4     2

Below results are for rng = 2

rows =

       1     4

rows =

       2     3

Below results are for rng = 1

rows =

       2     4

rows =

       1     3
  N_UE=6
  Below results are for rng = 3

rows =

       6     2

rows =

       1

rows =

       5

rows =

       4     3

Below results are for rng = 4

rows =

       5     1     4

rows =

       2

rows =

       3     6

Below results are for rng = 5

rows =

       2     4

rows =

       5     3

rows =

       1     6

Below results are for rng = 6

rows =

       3     4     1

rows =

       2     6     5

Below results are for rng = 7

rows =

       5

rows =

       4     6

rows =

       3     1     2
  N_UE=8
  the following result should be 
  Below results are for rng = 8

rows =

       5     4     7

rows =

       2     1

rows =

       3     8     6

Below results are for rng = 9

rows =

       5

rows =

       1

rows =

       3     6

rows =

       7

rows =

       4     2     8

Below results are for rng = 10

rows =

       1     8     6

rows =

       5

rows =

       4

rows =

       3     2     7

Below results are for rng = 11

rows =

       4     1

rows =

       2     8

rows =

       7     5

rows =

       6     3

Below results are for rng = 12

rows =

       6     3

rows =

       2     5     7

rows =

       4     8     1

Below results are for rng = 13

rows =

       1     5     6

rows =

       2     4

rows =

       8     3     7

Could you please help me on this.

[Prabha Kumaresan]

With respect to the code given

unused_rows=1:6
while ~isempty(unused_rows)  
N_UE_rows=2;   
rng(3)
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
[~,idx]=find(ismember(unused_rows,rows))
unused_rows(idx)=[]
end

Could you please help me how to write the algorithm for it.

[Prabha Kumaresan]

with respect to the code given

list_of_list_of_seeds = {[12, 2, 1], [3 4 5 6 7],[8 9 10 11 12 13]};
   for seed_idx = 1 : length(list_of_list_of_seeds)
     list_of_rng_seeds = list_of_list_of_seeds{seed_idx};
     num_rng = length(list_of_rng_seeds);
     for rng_usage_idx = 1 : num_rng
       this_seed = list_of_rng_seeds(rng_usage_idx);
       fprintf('Below results are for rng = %d\n', this_seed);
       rng(this_seed);
       unused_rows = 1:6;
       while ~isempty(unused_rows)
         N_UE_rows = 2;
         rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
         [~,idx]=find(ismember(unused_rows,rows))
         unused_rows(idx)=[]
       end
     end
   end

could you please help me how to write the algorithm for it.

[Walter Roberson]

I am not sure what you mean by "write the algorithm for it" ? Are you asking for something like a flow chart? Are you asking for pseudocode to write into project documentation ?

None of the people who has been volunteering to respond to your questions are able to write the pseudocode for that, because not one of us has been able to understand why you want to keep setting the random seed.

[Prabha Kumaresan]

yes the flow chart.

[Walter Roberson]

Flow charts are usually fairly straight forward to write once you have the code. I find reference to a commercial tool http://www.aivosto.com/visustin.html which can generate flow charts from MATLAB. See also https://stackoverflow.com/questions/5518200/automatically-generating-a-diagram-of-function-calls-in-matlab