[R] Sum of vector elements

[R. Michael Weylandt]

I'd do something like this:

x <- sample(seq(-10, 10))

sum(x[seq_len(which.max(x > 0)])

Though others might have more direct solutions.

which.max() gets you the index of the first time x > 0 -- seq_len
gives you numbers 1 to that index -- then just subset and sum like
normal.

Best,
Michael

On Tue, Aug 7, 2012 at 7:37 AM, number10 <havana_dream at ymail.com> wrote:
> Hi, Is it possible to avoid using do and while loops to calculate the sum of
> the elements of a vector until the appearance of the first positive element.
>
>
>
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