please help me in sort row

I have a row,

x = [0 0 0 0 0 40 40 -40 -40 -40 -40 -40 -40 80 80 80 80 80 80]; x1=x;
[xi, u_x] = hist(x1, unique(x1));

output,

 u_x =

   -40     0    40    80

 xi

 xi =

     6     5     2     6

but i want to sort this according to given x,

 [0 40 -40 80]

and

 [5 2 6 6]

should be output of both x_u and x_i respectively. please help me.

Answer 1

[Stephen23]

x = [0,0,0,0,0,40,40,-40,-40,-40,-40,-40,-40,80,80,80,80,80,80];
[uni,idu] = unique(x);
[cnt,idx] = hist(x,uni);
[~,ids] = sort(idu);
cnt = cnt(ids)
idx = idx(ids)

and the outputs:

cnt =
   5   2   6   6
idx =
    0   40  -40   80

[Triveni]

Thank you :D