zero crossing determination in octave?

[Carlo de Falco]

On 05/dic/08, at 22:37, 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.
well...
even a trivial function can contain mistakes ;)
fix attached,
c.

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