Would you please help me to correct this code?

Hi, I want to generate a 4*12 matrix that consists of 0 and 1 elements only that each row is divided into 2 sections with 6 elements. For example in row 1, in the first 6 elements, maximum number of consecutive 0 arrays should be 3, in the second 6 elements maximum number of consecutive 0 arrays should be less than or equal to 4 and so on(Max matrix in code). I've coded it but there are some parts I don't know how to code. Would you please help me with it? (Questions are asked on code in % comments.)

X = zeros(4,12);

Max = [3,4;4,5;3,5;2,4];
counter=0;

for i = 1:4
    for j = 1:2
        while z <= 6
            X = round(rand(1,Max(i,j)));
            if X(i:Max(i,j))==0            %is : right? I it to consider each element in that range.
                counter = counter+1;       % for each zero, a unit needs to be added to counter.
            else continue;
                if counter >= Max(i,j)              
            X(i,z+1) = 1; % I want it to set the value of the next immediate element after the last zero equal to 1.
            counter = 0;  % and restart the counter for the next 0 appearing. 
                    else continue; % i want it to continue the loop exactly from last element with the value of 1 
                end
            end
        end
    end
end

Answer 1

[James Tursa]

Try this code (assumes spot_length is not too large):

nrows = 4; % Number of rows
ncols = 2; % Number of column spots
spot_length = 6; % Length of each column spot
X = zeros(nrows,ncols*spot_length); % Allocate result
Max0 = [3,4;4,5;3,5;2,4]; % Max number of consecutive 0's for each spot (should be nrows x ncols)
for m = 1:size(Max0,1)
    for n = 1:size(Max0,2)
        p = good_patterns(spot_length,Max0(m,n)); % Get allowable patterns for this spot
        k = spot_length*n - 5; % Starting column number for this spot
        X(m,k:k+spot_length-1) = p(randi(size(p,1)),:); % Pick a random allowable pattern
    end
end
X = X - '0'; % Turn char array into double array

with this supporting function:

function p = good_patterns(n,z)
p = dec2bin(0:2^n-1); % All patterns of length n
f = false(size(p,1),1); % Flag vector for picking off allowable patterns
bad = repmat('0',1,z+1); % The bad pattern we want to avoid
m = numel(bad);
for k=1:size(p,2)-m+1 % Step through the starting column of p
    f = f | all(bsxfun(@eq,p(:,k:k+m-1),bad),2); % Flag any bad patterns
end
p = p(~f,:); % Pick off the allowable (i.e., not bad) patterns
end

[Sherwin]

Thank you so much for your help. it says:

??? Input argument "n" is undefined.

Error in ==> good_patterns at 2 p = dec2bin(0:2^n-1); % All patterns of length n

Sorry it is so complicated and I'm new to MATLAB,so should take some time to understand it

[Sherwin]

and what if the matrix and the spot_length is large... like a 4*960 matrix that is divided into 60 elements instead of 6? can I just replace the values?

[Sherwin]

And I think there has been a misunderstanding. The matrix has only 0 and 1 elements they are not binary representations of anything. Something like round(rand(1,max(i,j)) might help. But I don't know enough.