How to use helperFreq​uencyAnaly​sisPlot1 in Matlab 2018b

2018 11 14
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Hello everyone,
I am trying to use this function in Matlab 2018b: helperFrequencyAnalysisPlot1
However the function does not work. I get the following error: Undefined function or variable 'helperDFTEstimationPlot1'.
I have tried 'edit('helperFrequencyAnalysisPlot1.m') and still, it doesn't find anything.
I am following this tutorial: https://uk.mathworks.com/help/signal/examples/practical-introduction-to-frequency-domain-analysis.html
Does anybody know how can I use it?
Also, is there any specific package or tutorial on how to perform ECG frequency domain analysis?
Thank you for your time.
Best,
Gianluca

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