zero crossing determination in octave?

[Carlo de Falco]

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.

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