Question

While calling a function inside a for loop I need to store all return values into a column matrix nx1 if n is number of times loop iterates:

for (i = 1:n)
        function(arg);
end

After storing these values I need to get top five values as well.

Answer 1

You can use following code:

res = zeros(n,1);
for (i = 1:n)
        res(i)=function(arg);
end

Allocation before loop is required to be sure that you have column matrix instead row.

Edit:

Answer for last question: After storing these values I need to get top five values as well.

You can use sort function to receive best values:

res=sort(res);
result=res(1:5)