how to save the outputs obtained by a for loop repeated n times

i built a for loop that works N times and in each loop produces as an output a matrix (6x3), i need to save every output in a matrix by column (6xN*3).

In my example the for loop is shown below and "tot" give to me only the last result of the loop.

PS. Just to let you knok "Tin" is a table that contains some data

function [Tout ] =Trasporta(Tin)

for group = 1:4:size(Tin,2)
[ordine(:,group), idx(:,group)] = sortrows(Tin{:,group});
end
% my question is about the for below
tot = nan(6,18);  %N=6      N*3=18      the number of rows is 6, and the loop is repeated for 6 times
for i = 1:4:size(idx,2)
   
       tot =  (Tin{idx(:,i),i+1:i+3});
        
end
end

Answer 1

[per isakson]

tot is overwritten in each iteration of the for-loop

Replace

tot =  (Tin{idx(:,i),i+1:i+3});

by

tot(:,i) =  (Tin{idx(:,i),i+1:i+3});

[Francesco Grechi]

if i do it i got an error:

Unable to perform assignment because the size of the left side is 6-by-1 and the size of the right
side is 6-by-3.

Error in Trasporta (line 14)
       tot(:,i) =  (Tin{idx(:,i),i+1:i+3});

[per isakson]

Since I don't know your data I couldn't test. The indexing of tot was obviously wrong. Try

tot(:,i:i+2) =  (Tin{idx(:,i),i+1:i+3});

[Francesco Grechi]

now it works