Periodogram in Octave/Matlab vs Scipy

Question

I am porting some matlab code to python using scipy and got stuck with the following line:

Matlab/Octave code

Answer 1

I faced the same problem but then I came across the documentation of scipy's periodogram

As you would see there that detrend='constant' is the default argument. This means that python automatically subtracts the mean of the input data from each point. (Read here). While Matlab/Octave do no such thing. I believe that is the reason why the outputs are different. Try specifying detrend=False, while calling scipy's periodogram you should get the same output as Matlab.