# Error in a for loop

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Nikolaos Zafirakis on 14 Jul 2019
Answered: SaiDileep Kola on 17 Jul 2019
I’m trying to run a loop through some measurement but I keep getting this error "Unable to perform assignment because the size of the left side is 3-by-1 and the size of the right side is 2-by-1." Does anyone know a way around this?
o = B(1:50,2);
for ind = 1:length(o)
a1(:,ind) = diff(o);
[c1(:,ind),d1(:,ind)] = find(a1(:,ind)>2^15);
[e1(:,ind),f1(:,ind)] = find(a1(:,ind)<-2^15);
o(c1(:,ind)+1:e1(:,ind)) = o(c1(:,ind)+1:e1(:,ind))-2^16; % Error Happens here
end
Nikolaos Zafirakis on 14 Jul 2019
Original data
The result after 2 iterations of the code i showed you (I want to run what I showed you in a loop).

SaiDileep Kola on 17 Jul 2019
Hi,
I see that you get the error in 3rd line in the for loop not in the of 4rth line as you mentioned, I think your use case can be realized with the following code.
o = B(1:50,2);
for ind = 1:length(o)
a1 = diff(o);
c1 = find(a1>2^15);
e1 = find(a1<-2^15); %Error happens here
o(c1+1:e1) = o(c1+1:e1)-2^16; % Error doesn't occur here
End

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