Adding numbers in array in a specific order

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Raza Hassan
Raza Hassan 2020-3-25
评论： Raza Hassan 2020-3-26
Need to create a code for the following statement:
let a=[1 3 5 6 6 7 7 7] , b=[81 122 245 329 656 790 850 1023]
c=[1 1 1 2 3] where c is showing how many times a unique value of a has been repeated e.g. '1' is repeated '1' time, '6' is repeated '2' times and so on.
Now what I need to do is to create d such that if 1st index of c is 1 then assign 1st index value of b to d and if 1st index of c is 2 then assign 1st and 2nd index value of b to d.
In short what I need is d which will have value d=[81 122 245 329+656 790+850+1023].
Will appreciate your help:D

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采纳的回答

Stephen23
Stephen23 2020-3-25
>> [~,~,X] = unique(a);
>> d = accumarray(X(:),b(:))
d =
81
122
245
985
2663
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Stephen23
Stephen23 2020-3-26
>> [~,~,x] = unique(a);
>> d = zeros(1,max(x));
>> for k = 1:numel(b), d(x(k)) = d(x(k)) + b(k); end
>> d
d =
81 122 245 985 2663

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