how to generate cell array based on the size of it.

My command is B = arrayfun(@(N) randi(2,1,N), repelem((1:3).',5), 'uniform', 0)

when i run it generates B= 15×1 cell array

{[ 2]}

{[ 1]}

{[ 3]}

{[ 3]}

{[ 2]}

{1×2 double}

{1×2 double}

{1×2 double}

{1×2 double}

{1×2 double}

{1×3 double}

{1×3 double}

{1×3 double}

{1×3 double}

{1×3 double}

but the values inside the array are

1

1

2

1

2

[2,1]

[2,1]

[1,2]

[2,2]

[1,1]

[2,2,1]

[1,2,1]

[2,2,2]

[1,1,1]

[2,1,2]

Actually i need to get

1

1

3

1

1

for first 5 rows the value should be 1 as it is 1x1 double

[1,2]

[2,1]

[3,2]

[3,2]

[2,1]

for the next 5 rows the values should be 1,2 and not more than 2, and should not have 2 by leaving 1

[1,2,1]

[3,1,3]

[2,3,3]

[1,2,2]

[3,3,1]

for the next 5 rows the values should not have 3 by leaving 2 and should not have 2 by leaving 1.

Could anyone please help me with this.

Answer 1

[Mohammad Sami]

I am bit confused what you mean by should not have 3 by leaving 2 and should not have 2 by leaving 1.

I assume you just want the numbers in order 1,2,3.

B = arrayfun(@(N) colon(1,N), repelem((1:3).',5), 'UniformOutput', false)

B = 15×1 cell array
    {[    1]}
    {[    1]}
    {[    1]}
    {[    1]}
    {[    1]}
    {[  1 2]}
    {[  1 2]}
    {[  1 2]}
    {[  1 2]}
    {[  1 2]}
    {[1 2 3]}
    {[1 2 3]}
    {[1 2 3]}
    {[1 2 3]}
    {[1 2 3]}

[jaah navi]

for first five rows the value should be one as mentioned , for next rows it can be of any possibilities of 1 and 2 i.e, 11, 12, 21 and should not be the values of 22 by leaving 1 as size is 1x2

For 11-15 rows it can be any possibilities of 1,2 and 3 and should not be the values of 333, 223 by leaving 1. as size is 1x3

if my explanation is not clear please reply me.

[Mohammad Sami]

so essentially you want random permutation of [1,2,3] ?

B = arrayfun(@(N) randperm(N), repelem((1:3).',5), 'UniformOutput', false)

B = 15×1 cell array
    {[    1]}
    {[    1]}
    {[    1]}
    {[    1]}
    {[    1]}
    {[  1 2]}
    {[  2 1]}
    {[  2 1]}
    {[  1 2]}
    {[  1 2]}
    {[3 2 1]}
    {[1 2 3]}
    {[3 1 2]}
    {[2 3 1]}
    {[1 3 2]}

[jaah navi]

for 6-10 rows now its not more than 2 what i actually need, but in addition i also need to have 11 in addition to 12, 21.

in the similar manner for 11-15 rows i can have any of the following values such as 112, 122, 212, 121, instead of all the rows containing 123.

could you please help me on this.

[Mohammad Sami]

I think you will need to write your own random function to generate these, since the built in functions don't have the behaviour you need.

function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    pass = false;
    while ~pass
        seq = randi(N,1,N);
        pass = all(ismember(colon(1,max(seq)),seq));
    end
end

B = arrayfun(@my_rand, repelem((1:3).',5), 'UniformOutput', false)

[jaah navi]

thanks for your help.

please let me know how to sort the values in each row of the cell array.

1

1

1

1

1

[2,1] - [1,2]

[1,2] - [1,2]

[1,1]

[1,2]

[1,2]

[3,1,2] - [1,2,3]

[3,1,2] - [1,2,3]

[1,3,2] - [1,2,3]

[2,1,1] - [1,1,2]

[3,1,2] - [1,2,3]

[Mohammad Sami]

You can just edit the my_rand function and add sort at the end.

seq = sort(seq);

[jaah navi]

Thanks. I have done sorting the values in each rows using the command line cellfun(@sort,B,'UniformOutput',false) which works similar to seq = sort(seq);

But I want to sort the rows of the cell array. Suppose my cell array containing rows as

[1,2]

[1,2]

[1,1]

[1,2]

[1,1]

I want those rows to be sorted in the following manner

[1,1]

[1,1]

[1,2]

[1,2]

[1,2].

Could you please help me on this.

[jaah navi]

I would like to check if i run the code its taking long time to execute more than a hour.

function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    pass = false;
    while ~pass
        seq = randi(N,1,N);
        pass = all(ismember(colon(1,max(seq)),seq));
    end
end
B = arrayfun(@my_rand, repelem((1:24).',2000), 'UniformOutput', false)

So, please let me know is there any way to execute it faster.

[Mohammad Sami]

How about we change the function to a combination of randperm, randi

function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    max = randi(N);
    s1 = randperm(max);
    s2 = randi(max,1,N-max);
    seq = [s1 s2];
    seq = seq(randperm(N));
end

[jaah navi]

Thanks it works. Also, I would like to check the following issue.

Based on the above command

A = arrayfun( @my_rand, repelem((1:5).',300)', 'UniformOutput', false);
function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    max = randi(N);
    s1 = randperm(max);
    s2 = randi(max,1,N-max);
    seq = [s1 s2];
    seq = seq(randperm(N));
end

B = arrayfun( @my_rand, repelem((1:5).',300)', 'UniformOutput', false);
function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    max = randi(N);
    s1 = randperm(max);
    s2 = randi(max,1,N-max);
    seq = [s1 s2];
    seq = seq(randperm(N));
end

Here, I am having two array A and B

when I run the code i can get the A and B

But the difference between A and B is very large. As 900 array are created for A and B is there any way to create the maximum number same values in both A and B. For example 800 array should be generated as equal and the rest 100 can be different. could you please help me on it.

[Mohammad Sami]

You can simply generate A or another variable. Then you can use randperm to sample A to get B. For example if you have an array of 20 values and you want to choose 10, you can do like this.

if true
  A = 1:2:40;
  B = A(randperm(20,10));
end

Answer 2

[jaah navi]

The following code executes as per required.

A = arrayfun( @my_rand, repelem((1:24).',500),  'UniformOutput', false);
function seq = my_rand(N)
    if N == 1
        seq = 1;
        return;
    end
    max = randi(N);
    s1 = randperm(max);
    s2 = randi(max,1,N-max);
    seq = [s1 s2];
    seq = seq(randperm(N));
    seq = sort(seq);
end

But in addition I want the above code to execute

10x1 double, 10x2 double, 10x3 double,......, 10x24 double instead 1x1 double, 1x2 double, 1x3 double,......, 1x24 double.

Could you please help me on this.