Finding Valleys for Absolute Sine Wave

[hylian_marq]

I have an absolute sine wave and I am using the Waveform Peak Detection function to find the peaks an valleys. The detection at the peaks works well but valley detection is returning an empty array. I suspect that it is because the sharpness of the valleys. I am struggling to think of a solution for this.

[Gregory]

Could you attach your code and sample data here? You can set sample data by allowing the graph to populate, select it, then select Edit >> Make current values default.

[NIquist]

🤔 The sharpness of the valleys should make them even easier to detect. 

There's not much point in guessing what could be wrong though.  If you want some help, post your code...  

[Gregory]

I generated some similar looking curves, and it works fine for me:

[hylian_marq]

Here is the code, the graph shown was plotted after the first peak detect and before the Butterworth filter

[Gregory · Accepted solution]

You are using the default threshold of "0" for your valley detector. Since your signal never goes below 0, you won't detect any valleys. If you set it to "0.1" you will detect them.