How to save the last four iterations in a for-loop

Hi all,

I have a basic for-loop and I would like to know how I can only save (or retain) the last 4 iterations of the loop instead of all. For example:

clear ; clc

b = 2 ;

for i = 1:100
    a(i) = b + 4 ;
end

would save all iterations from i=1 to 100. How could I have only the last four while the loop is running? (that is without having the for-loop execute and then just extract the final four iterations)

Thanks for your help in advance.

Answer 1

[Matt J]

One way:

for i = 1:100
    a(max(i-96,1)) = b + 4 ;
end

Answer 2

[Voss]

Here's one way:

clear ; clc

b = 2 ;

for i = 1:100
    if i > 96
        a(i-96) = b + 4 ;
    end
end