Trouble with findpeaks for EEG data from a csv file "Expected X to be strictly increasing" (x is the timestamp)
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Christina Diersing
on 11 Jul 2021
Commented: Christina Diersing
on 12 Jul 2021
Hi,
So I'm really new at working with EEG data and I am having trouble finding the peaks of data I imported from a csv file. This is the error I keep getting:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/681458/image.jpeg)
I can't find where the 'non-increasing' part of the timestamp is, and I don't know how to fix the problem. Can someone please help me with this?
I've attached a zip folder with the csv file I used and the Matlab code I tried to use.
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Accepted Answer
Image Analyst
on 11 Jul 2021
You reversed the inputs. It's findpeaks(y, x), not findpeaks(x, y):
[peakValues, indexesOfPeaks] = findpeaks(AF3, timestamp);
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