how to repeat [5,4,3,2,1.....] infinitely?

how could I?

can someone give me a code?

[Rik]

Your computer does not have infinite memory. What exactly did you intend to do with this infinite vector?

Answer 1

[Bruno Luong]

A meta-array:

x = rep5to1(100:120)

x = 1×21

1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1 5 4 3 2 1

%%
function x = rep5to1(i)
a=5:-1:1;
x = a(mod(i-1,length(a))+1);
end