How to perform operation on sepcific elements in an array?

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I have an array 'A' of size 1×365. There is an another array 'B' consisting of linear indexing of size 1×160. Now I want to create another array 'C' of size 1×365 where I have to perform operation on the elements according to the index of B. For example A=[2 4 6 8 10] B=[1 4] I want to perform A-2.5 on the elements of A to create a new matrix C and convert the remaining elements to zero in A. The answer will be C=[-0.5 0 0 5.5 0] As B(1)=1 and B(2)=4 so the mathematical operation is performed only on those elements and the remaining elements are converted to zero. How Can I do this? Thankyou in advance.