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sum, vector elements, except i-th

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mehrdad asadi
mehrdad asadi 2015-7-8
评论： mehrdad asadi 2015-7-8
hi,
how can I sum vector elements, say v = rand(1,30), except 12th one?
thanks,

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Mona
Mona 2015-7-8
You can always do the sum, then subtract that single element, 12th, from the sum.
v = rand(1,30);
sum_except12=sum(v)-v(12)

更多回答（1 个）

Guillaume
Guillaume 2015-7-8
编辑：Guillaume 2015-7-8
some other options:
sum(v([1:11, 13:end]))
sum(v(setdiff(1:end, 12))
This latter one, will also work if you have a set of indices you want to exclude. e.g.:
sum(v(setdiff(1:end, [5 12 18])) %sum of v except elements 5, 12, and 18

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