# I need help with a for loop that gives me an assignment error.

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Barbara Wortham 2018년 5월 7일
댓글: Barbara Wortham 2018년 5월 7일
Hi all, I'm a beginner to Matlab but I have this code:
clear
clc
X_nf=randi([10 50],1,10);
sigma_x=rand(1,10);
N=numel(X_nf);
V=zeros(length(X_nf),10);
for i=1:10
V(i)=X_nf+sigma_x.*randn(1,N)
end
and it is giving me this error: In an assignment A(:) = B, the number of elements in A and B must be the same. I would like it to create the variable V that has a 10x10 matrix of numbers that are varied a little bit from the variable X_nf with the random noise I am adding.
Any help would be great. Thanks!

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### 채택된 답변

sloppydisk 2018년 5월 7일
When you get this kind of error you want to look at the line (11 in this case) and check the sizes of the different variables. So let's look at
size(V(i))
size(X_nf)
size(sigma_x.*randn(1,N))
Now we see that V(i) is just a 1x1, while the others are 1x10. So instead we should probably write:
V(i, :) = X_nf+sigma_x.*randn(1,N)
This indexes the i-th row instead of just the i-th element.
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Barbara Wortham 2018년 5월 7일
Thanks! Life Saver!

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