sum of complicated numbers
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how can I add these numbers
1:2:101 , 1:-2:101
3 Comments
Image Analyst
on 15 Feb 2022
Do you mean he had said previously
1 -3 5 -7 9 -11 13 -15 17 -19 21
and then changed it to the null vector 1 : -2 : 101 ?
Answers (1)
DGM
on 15 Feb 2022
Edited: DGM
on 15 Feb 2022
Consider the reduced example.
N = 21;
n = 1:2:N
n = (1-2*mod((n-1)/2,2)).*n
s = sum(n)
If you must absolutely do it with a loop, you can use the above arithmetic to generate the sequence.
EDIT:
The revised question does suggest its own method which works just as well:
N = 21;
n = sum([1:4:N -(3:4:N)])
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