how do I switch values in a random matrix without using witch or any kind of loop?

I need to change this matrix

x = round(0+(4)*rand(20,30)) which contains the values 0,1,2,3,4 to the matrix y - - if - x(i,j)=0 than y(i,j)=5

if x(i,j)=1 than y(i,j)=4

if x(i,j)=2 than y(i,j)=3

if x(i,j)=3 than y(i,j)=2

if x(i,j)=4 than y(i,j)=1

this sould be done without using any kind of loops any ideas?

Answer 1

[Matt J]

 y=5-x;

[ilona]

omg I think this is actually that simple! thank you so much!