A and B are coupled vectors. How can I get from A->A_new B-> B_new?

 A = [0      1       2       3       4       8       3       4       5];
 B = [0.1    0.2     0.2     0.3     0.4     0.2     0.3     0.5     0.5];

 A_new = [0      1       2       3       4       8       5];
 B_new = [0.1    0.2     0.2     0.6     0.9     0.2     0.5];

Answer 1

[Guillaume]

 [A_new, ~, columns] = unique(A, 'stable')  %stable optional if ordering does not matter
 B_new = accumarray(columns, B).'

[Amelos]

Thanks