Findpeaks function

Hello

I have two signals x and y ploted versus time vector t (please refer to
function below). I am trying to create two result vectors named result1 and
result2.

The vector result1 should find local peaks (max values). Function
"findpeaks" rejects the inputs since they include negative values so I am
kind a stuck. It should find the local max values and give back the value
and its index.

The vector result2 should give back index of crossing of x and y, where
these are zero (or close to zero). On the chart you can see that not all
crossings of x and y fullfill this condition.

Am I using the "findpeaks" function wrong? Is there a way to accept the
signals with negative values as well?

For result2 is there a function to do this?

Any help is much appreciated.

Thanks

  Wave_peaks.png
<https://octave.1599824.n4.nabble.com/file/t373917/Wave_peaks.png>  



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