why this code is not running ? the workspace remains empty.

m = zeros(1,163);
count = 1;
flag= 0;
while 1 
    r = randi([1,326]);
    for i = 1:1:count
        if(m(1,i)==r)
            flag = 1;
        end
    end 
    if(flag==0)
        m(1,count)=r;
        count=count+1;
    end
    if(count==163)
        break;
    end
end

Answer 1

[James Tursa]

Once flag gets set to 1, you don't ever reset it to 0 so you effectively disable the rest of your code and count ceases to increment and you have an infinite loop. So move the flag=0 line to inside your loop. E.g.,

m = zeros(1,163);
count = 1;
while 1 
    r = randi([1,326]);
    flag = 0;  % <-- Moved to here
    for i = 1:1:count
        if(m(1,i)==r)
            flag = 1;
        end
    end 
    if(flag==0)
        m(1,count)=r;
        count=count+1;
    end
    if(count==163)  % <-- Is this really what you want?
        break;
    end
end

Also, your code exits the loop before setting the last element. If you want to set that last element, change your if(count==163) test to if(count==164).

Finally, it looks like you are simply wanting to generate an array of random non-repeating integers between 1 and 326. This entire code could be reduced to this one line:

m = randperm(326,163);

Or if you have an older version of MATLAB:

m = randperm(326);
m = m(1:163);

[debmalya roy]

thanks a lot sir. can you please tell me how can I work with a .csv file ? it consists "att_1","att_2" like this alpha numeric characters . So its being very difficult for me to read and manipulate this through code .