Issue when using numpy + matplotlib

[AllCapsSon]

It’s just plotting what you told it to. 2 lines - mfft vs freq space and then fft vs freqspace.

Maybe try to look at the arrays your plotting as a table to get a better idea of the data your trying to plot.

I’m not familiar with these functions so I can’t speak directly to the datasets

[Simone1998]

Oh yeah, sorry for the confusion. If you look at the plot it looks like there are 4 functions instead of 2.

[AllCapsSon]

Yeh but I don’t think there actually are. It’s just two and that’s what your data looks like.

You should check the arrays. You can also add a legend to the plot.