I want the code to randomize the rows and present each row for 10 times

I want the code to randomize the rows and present the stimulus by taking the each row values for 10 times. Here is the code that I have written.

Decentration = [0, 0.5; 0, 0; 0, -0.5; -0.5,0; 0.5, 0];
trial = 10;
for i = 1:trial;
    for iter= 1:length(Decentration);
    Decentration = Shuffle(Decentration, 2); 
    XDecentration = Decentration(:,1);
    YDecentration = Decentration(:,2);

this presents the stimulus for 50 times but in a different proportion.

Please suggest a code for presenting each row of Decentation to be selected 10 times.

[KALYAN ACHARJYA]

Can you explain more?

You have Decentration = [0, 0.5; 0, 0; 0, -0.5; -0.5,0; 0.5, 0]; data,

you expectation from the Decentration matrix data?

Answer 1

[Walter Roberson]

Decentration = [0, 0.5; 0, 0; 0, -0.5; -0.5,0; 0.5, 0];
trial = 10;
n = size(Decentration, 1);
idx = repmat(1:n, 1, trial);
order = randperm(size(idx,2));
randrows = Decentration(order,:);
XDecentration = randrows(:,1);
YDecentration = randrows(:2);

This code will present each row exactly trial times, but not in groups. For example, the second row might happen to occur twice in the first 10 stimuli. Or occur 10 times even (though that is not likely)

This is not the code to present each stimuli exactly once per trial: it is code that preserves the correct portions of entries over the entire experiment but not in the short term.

[Bhagya Lakshmi Marella]

This code gives error.

Index exceeds matrix dimensions.

Error in Disp_InvGabor (line 77)

randrows = Decentration(order,:);

[Walter Roberson]

 randrows = Decentration(idx(order),:);

Answer 2

[KALYAN ACHARJYA]

Is this?

decentration = [0, 0.5; 0, 0; 0, -0.5; -0.5,0; 0.5, 0];
random_data=decentration(randperm(size(decentration, 1)),:);
[rows colm]=size(random_data);
trial = 10;
decentration_data=cell(rows,trial);
for i=1:rows
    for j=1:trial
     decentration_data{i,j}=random_data(i,:);
     % I assume you have some process here, like apply stimulus to respective rows
    end
end

[Bhagya Lakshmi Marella]

what would be XDecentration and YDecentration here?

[KALYAN ACHARJYA]

decentration=[0, 0.5; 0, 0; 0, -0.5; -0.5,0; 0.5, 0];
[rows colm]=size(decentration);
trial = 10;
for i=1:rows
    random_data=decentration(randperm(size(decentration, 1)),:);
    for j=1:trial
          XDecentration=random_data(:,1);
          YDecentration=random_data(:,2);
     % I assume you have some process here, like apply stimulus to respective rows
    end
end

Here exposed the 1st and 2 column of random_data for 10 times...

again resuffle rows and

exposed the 1st and 2 column of random_data for 10 times...

You can change the code as per your requirements, or let me know more..!

[Walter Roberson]

The above would present the data in a random order 10 times, but always the same order. It will also present the data in groups of 5, using all of the rows within each group.

[Bhagya Lakshmi Marella]

Thank you so much.

It works. But it presents the selected random_data 10 times continuously. I also want this to be random

[KALYAN ACHARJYA]

trial=randi(10);
% This generages the random trial number (maximum 10), change it accordingly 

Like

trial=randi(maximum_allowable_trail_number);
%....................^^ enter any max number here

Check here examples

>> trail=randi(20)
trail =
    16
>> trail=randi(20)
trail =
     7
>> trail=randi(20)
trail =
    11

Good Wishes!

Answer 3

[Bruno Luong]

The array B of the below has exactly 10 times each row of A in random order:

m = size(A,1);
B = A(mod(randperm(10*m),m)+1,:);