sum, vector elements, except i-th

hi,

how can I sum vector elements, say v = rand(1,30), except 12th one?

thanks,

Answer 1

[Mona]

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)

[mehrdad asadi]

oh good point :) thanks

Answer 2

[Guillaume]

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

[mehrdad asadi]

Guillaume,

your answers are always different.

thanks and regards,