Help for data in txt file

Hy all, i have a txt file in which i stock some integers in brute manner, i need to create a copy of this file but i stock my integer in decrase order with no repitition, forme example: A.txt

2
3
3
1

B.txt

1
2
3

Please healpe my

Answer 1

[Azzi Abdelmalek]

use unique function

b=[2;3;3;1]  
a=unique(b)

[Ferial Assmani]

Very helpful, as i see is not necessary to use sort option

c = sort(unique(b));

is it right ?

[Azzi Abdelmalek]

yes, but if you want to use unique function without sorting

c=unique(b,'stable')

[Stephen23]

@Ferial Assmani: The output of unique is sorted by default, as the documentation clearly states.