MATLAB Answers

Counter in for loop is not working as expected

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Rashed Fairouz
Rashed Fairouz on 26 Jun 2020
Commented: Walter Roberson on 27 Jun 2020
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.

  2 Comments

KSSV
KSSV on 27 Jun 2020
You are alwasy filling 1 and 2 in the matrix...
Mats(1,i)=1;
Mats(1,i)=2;
Walter Roberson
Walter Roberson on 27 Jun 2020
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)

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Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 27 Jun 2020
data1=ones(1,3);
data2=1+ones(1,5);
result=repmat([data1,data2],1,5)

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