save data in a array

Hi, I have a problem: I have create this code

for j=1:size(user(4).data(5).idx,1)
    if (user(4).data(5).idx(j,1)~=0)
        a=Cluster_USERS{4,1}(user(4).data(5).idx(j,1),4)
     end
end

now I have:

a =

       7

a =

       7

a =

       7

a =

       0

I want a=[ 7 7 7 0], how can I modified the code?

Answer 1

[Rik]

You forgot a semicolon (the ; sign) to suppress output and a was overwritten each loop itteration.

There is a method to use logical indexing instead of a loop. The code below should work.

a=Cluster_USERS{4,1}(user(4).data(5).idx(:,1)~=0,4);