Matlab fft vs Sac fft

It seems as though matlab fft function is shifted up or down by 10^2 in a loglog plot when compared to SAC. I have tried to fix this using many of the methods on the site but they just flip the direction of the shift down to up or vice versa. Does anyone have experience in fixing this and an explanation as to why it is happening. Have been working around 10 hours to fix it your help is appreciated.

Thanks,

J

Answer 1

[Bjorn Gustavsson]

Check the documentation of both for how the normalization of the ffts are done. typically there are a factor of 1/N that should be handled, this can be handled with slightly different conventions.

HTH

[Joseph Borkovich]

Hi thanks, I had done that and they seemed to go about it in the same way, however sac didn't have details on its procedure but said it performed a DFT like in MATLAB.