Add elements of a vector

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Sofia Melo Vasconcellos 2017-3-6

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回答： Roger Stafford 2017-3-7

Hello Assuming you have a list of N elements, how to add those elements 10 out of 10, and store the values of each sum in a new vector? I have the impression that using a control structure would help, but I can not see how Thank you!

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Answer 1

dpb 2017-3-6

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Not sure what you really mean here, but what about cumsum, maybe???

>> z=1:10;
>> cumsum(z)
ans =
   1     3     6    10    15    21    28    36    45    55
>>

If that's the right answer to the wrong question, give an example input and expected output and how it was obtained.

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Answer 2

Roger Stafford 2017-3-7

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Your phrase “add those elements 10 out of 10” is not very specific. I give the solutions to two possible interpretations. Let V be the vector of N elements.

1.) N is a multiple of 10 and you want to take the sum of successive blocks of 10.

Result = sum(reshape(V,10,[]),1);

2.) You want the sum of each successive subsequence V(1:10), V(2:11), V(3:12), V(4:13), ..., V(N-9:N).

Result = sum(hankel(V(1:10),V(10:N)),1);