Counter in for loop is not working as expected

I want the matrix to display [1 1 1 2 2 2 2 2 1 1 1 2 2 2 2 2.........5 times].

Nel=100
Neln=20
Nelnl1=5
Nelnl2=15
Code: 
Mats=zeros(1,Nel);
for i=1:Nel
    j=1;
    if j<=Nelnl1
        Mats(1,i)=1;
        i=i+1;
        j=j+1;
    elseif j>Nelnl1&&j<=Nelnl2
        Mats(1,i)=2;
        i=i+1;
        j=j+1;
    end
end
Mats

Doesn't give me correct value. It just displays all 1's at the end.

[KSSV]

You are alwasy filling 1 and 2 in the matrix...

Mats(1,i)=1;
Mats(1,i)=2;

[Walter Roberson]

Until you know matlab much better, and have very good reasons for doing so, you should adopt the rule that you never modify a for loop variable inside its for loop. Elsewhere I have described in detail how for loops work in MATLAB, but at this point you should just treat it as being an error to modify i within for i. (It is not actually an error, but it does not do what you expect and is very likely to be a source of bugs)

Answer 1

[KALYAN ACHARJYA]

data1=ones(1,3);
data2=1+ones(1,5);
result=repmat([data1,data2],1,5)