cannot calculate mean on for loop

Hello,

I have a problem of calculating means of groups.

I want to stack up each ratings' means on particiapants in neg group.

I cannot find what is wrong.

% data group speration (negative/neutral/positive)
A = data % 35(participant) x 300( 3 group have each 10 videos x 10 ratings (10 emotions))
neg = A(:, 1:100) 
neu = A(:, 101:200)
pos = A(:, 201:300)

neg_m=[ ] % i want to stack up each ratings' means on particiapants in neg group.
for ni=1:35
    for i=1:10
        meann=mean(neg(ni,i:10:90+i)) 
        neg_m(ni)=meann 
    end
end

Answer 1

[Jan]

The elements of neg_m are overwritten repeatedly in the inner loop. Maybe you want:

for ni = 1:35
    neg_m(ni, :) = mean(reshape(neg, 10, :), 1); 
end

If so, this would work without a loop also.

[다영 박]

unfortunately it's not working. Thanks for reply