I got some negative instantaneous frequencies

[Yuch969]

I have a negative value when calculating the instantaneous frequency of imf, and of course I have similar results when using matlab. After checking the data of imf, no negative maxima or positive minima were found. Is this normal? How do I deal with those negative values?

[byby221b]

I got the similar result and are also curious about the answer.

[jaidevd]

Hello, @Yuch969

Apologies for the huge delay in responding. Can you share some sample data - maybe a slice of the dataset you are using so I can reproduce this?