In an assignment A(I) = B, the number of elements in B and I must be the same

whenever i execute following code it gives an error "In an assignment A(I) = B, the number of elements in B and I must be the same.". How can i overcome the problem?

for i = 1:3
    mr_Ch(i) = (transpose(lab1_EEG(i,:))) - mean(transpose(lab1_EEG(i,1)));
end

Answer 1

[Jan]

This is a column vector:

temp1 = transpose(lab1_EEG(i,:)))

This is a scalar:

temp2 = mean(transpose(lab1_EEG(i,1)))

In consequence this is a column vector also:

temp3 = temp1 - temp2

Now you try to assign this vector to a scalar variable:

mr_Ch(i) = temp3

This must fail. What do you want to store in mr_Chi? We cannot guess, what you want to achieve. But perhaps this helps - without a loop:

mr_Chi = bsxfun(@minus, lab1_EEG, mean(lab1_EEG, 1)).';

[Chamira Wickramasinghe]

thank u very much :)