How to iterate through cell array of doubles

Hi all,

Let's say, I have a 1x7 cell

for i = 1:7
    num{i}=rand(randi(20),1);
end

Now I want to find sum of each element in a cell

for i = length(num)
    smth(i)=sum(num{1,i})
end

But I only get the sum of the last element

smth =

           0         0         0         0         0         0    5.9991

>> sum(num{1,end})

ans =

      5.9991

So I can't store the values. Can you guide me on this and explain how looping in cells works?

Thanks

Answer 1

[Guillaume]

The error is with the syntax of your for which should be:

for i = 1:length(num)    %and numel instead of length would be better

Also, since num is a vector, I'd use num{i} instead of num{1, i}. The former works whether num is a row, column or any other direction vector, the later only works with row vectors.