Thread Subject: Sign change detection

Hi,

I'm trying to find an efficient way to detect a FIRST change of sign per a given function
("first crossing").

Thanks,

Asaf

Assaf Weinstein wrote:
> Hi,
>
> I'm trying to find an efficient way to detect a FIRST change of sign per a given function
> ("first crossing").
>

cross = find(abs(diff(sign(x)))==2); % each crossing
first_cross = cross(1);

Salt to suit... :)

--

dpb <none@non.net> wrote in message <hbflgm$c1j$1@news.eternal-september.org>...
> Assaf Weinstein wrote:
> > Hi,
> >
> > I'm trying to find an efficient way to detect a FIRST change of sign per a given function
> > ("first crossing").
> >
>
> cross = find(abs(diff(sign(x)))==2); % each crossing
> first_cross = cross(1);
>
> Salt to suit... :)
>
> --

Thank you!
assaf