Re: zero crossing determination in octave?

[Jack Crenshaw]

Carlo de Falco wrote:
> On 05/dic/08, at 20:07, J. Patrick Bedell wrote:
>
> > Hello,
> >  Is there an octave function to compute (possibly using
> > interpolation) the points at which a given waveform crosses the x-axis
> > (or a specified threshold value)?
> >  Thanks!
> >
> >  Patrick
>
> Don't know whether this already exists but it seems to me it's trivial 
> to implement,
> see the attachment...
> c.
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Help-octave mailing list
> address@hidden
> https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
>   
Um ... I think Patrick was looking for a function that would iterate on 
the solution. In Matlab, that's fzero.  Your function is only a linear 
approximation, which might be Ok if the data array is dense, but 
otherwise, NG.

Jack