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Replace certain elements of vector with the values from another vector (average the values belonging the same position)

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TAPAN PATEL
TAPAN PATEL 2020-6-8
评论： TAPAN PATEL 2020-6-8
If A = [0 0 0 0 0] and B = [5 6 4] and C = [2 5 2] then
how can I get average of two values ​​belong to position 2nd in final answer that menas final answer should like A = [0 4.5 0 0 6]?

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KSSV
KSSV 2020-6-8
编辑：KSSV 2020-6-8
A = [0 0 0 0 0] ;
B = [5 6 4] ;
C = [2 5 2] ;
[c,ia,ib] = unique(C) ;
for i = 1:length(c)
A(C(ib==i)) = mean(B(ib==i)) ;
end

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