MATLAB: Help for data in txt file

Question

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

use unique function

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