Sum of some elements in two separate vectors

I have two different vectors (1000 numbers),A and B for instance. Each number of A has a specific value in B (A(i,1)=B(i,1)).

Some of A values are repeated. I want to sum the repeated values of A for each value of B and then plot A Vs B. for example:

A=[ 1 ; 2 ; 1 ; 5 ; 10 ; 5 ]

B=[0.1 ; 0.5 ; 0.2 ; 0.3; 0.8 ; 0.9]

For A=1, B=0.1 & 0.2 >>>> so when A=1, B=0.3 (sum of the values) For A=2, B=0.5 >>>> so when A=2, B=0.5 (It has the single value) For A=5, B=0.3 & 0.9 >>>> so when A=5, B=1.2 I have 1000 numbers for each A and B. Can you please help?

Answer 1

[Thorsten]

 [uA a b] = unique(A);
 sB = arrayfun(@(x) (sum(B(b==x))), 1:numel(a));

 X = [uA sB'];

[Amin Gan]

Thank you