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Mario3
Contributor
Contributor
‎2021-02-25 07:34 AM

Peak Detection visualization

Hello Qlikers, 

hope that you can help with this.

I have a high frequency data of a sensor (minute bases). The idea is that I need to visualize the data in a line chart already did this part. noting that if the value is considered as peak i need to show at least as a red dot. 

I hope that you can help on how I can do this in a line chart. I will attache the data and a screenshot of what did so far (the red dots are missing)  .

Thank you in advance.

electrical_signal_sorted - Copy.zip
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duchezbr
Contributor III
Contributor III
‎2021-02-25 03:26 PM

Can you set a threshold for [Electrical Power] that constitutes a peak? If so, try using the charts color and legend features.

  1. In 'Colors and Legends' Toggle Colors from Auto to Custom
  2. Set drop down to 'By expression'
  3. In the expressions box use:

If([Electrical Power]>700, Red(), Blue()) where 700 is an arbitrary threshold you choose.

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