Peak-finding algorithm for Python/SciPy
I can write something myself by finding zero-crossings of the first derivative or something, but it seems like a common-enough function to be included in standard libraries. Anyone know of one?
fft
Plotting a fast Fourier transform in Python
I have access to NumPy and SciPy and want to create a simple FFT of a data set. I have two lists, one that is y values and the other is timestamps for those y values.
how to extract frequency associated with fft values in python
I used fft function in numpy which resulted in a complex array. How to get the exact frequency values?
Analyze audio using Fast Fourier Transform
I am trying to create a graphical spectrum analyzer in python.
Convolving image with kernel in Fourier domain
I’m using zero padding around my image and convolution kernel, converting them to the Fourier domain, and inverting them back to get the convolved image, see code below. The result, however, is wrong. I was expecting a blurred image, but the output is four shifted quarters. Why is the output wrong, and how can I fix the code?
Improving FFT performance in Python
What is the fastest FFT implementation in Python?
How to calculate a Fourier series in Numpy?
I have a periodic function of period T and would like to know how to obtain the list of the Fourier coefficients. I tried using fft module from numpy but it seems more dedicated to Fourier transforms than series.
Maybe it a lack of mathematical knowledge, but I can’t see how to calculate the Fourier coefficients from fft.