change the order of array

I have M=[1,2 ;1,5; 2,4;2,5;4,5; 4,9;5,6;6,11;9,10;10,11] I want to change the order of numbers I want this answer N=[1,2;1,4;2,3;2,4;3,4;3,6;4,5;5,8;6,7;7,8]

[madhan ravi]

explain the pattern

Answer 1

[Bruno Luong]

[~,N] = ismember(M,unique(M(:)))

[NA]

is there any possibilities to save this order? for example 5 changes to 4, 8 changes to 11.

[Bruno Luong]

I guess you mean 11 changes to 8 (not the opposite).

u = unique(M(:));
map = [u,(1:length(u)).']