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Questions tagged [nfft]

NFFT is a software library, written in C, for computing non-equispaced fast Fourier transforms and related variations.

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How to compute nfft

I'm trying to understand how to use the nfft method of Jake Vanderplas' nfft module. The example unfortunately isn't very illustrative as I try to parametrize everything based on just an input list of samples ([(time0, signal0), (time1, signal1),…
tarabyte
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Is it possible to input a manual frequency axis as a function argument in np.fft and get the FFT evaluated at those frequency points?

I have an equation that can be expressed in a somewhat Fourier transform-like expression. (I can't find a way to write in latex format so I am trying to write in c code format). For a function f in a grid of M points, I evaluate a function on a kind…
Md Elious Ali Mondal
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Simpe example if using NFFT3 library

I am trying to use the NFFT3 library to perform a NFFT from non-equidistant spatial data to the corresponding equidistant Fourier coefficients. I'm implementing my project in C, in a Linux environment. To test the use of the library I am…
pieterinjapan
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Example python nfft fourier transform - Issues with signal reconstruction normalization

I wrote a full working example for both nfft, and scipy.fft. In both cases I start with a simple 1D sinusoidal signal with a little noise, take the fourier transform, and then go backwards and reconstruct the original signal. Here is my code as…
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Using NUFFT in Matlab R2015a

MatlabR2015a in Windows10 (X32). Because in 2015 version, there is not NUFFT, i downloaded, code for NUFFT from mathworks site (code by Matthew Ferrara). After i made "mex FGG_Convolution1D.c", (as described in "Overview"), i received : mex…
kraka
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FFT using Python

I am receiving data from a vibration sensor in the form of two numpy arrays. The first array represents the actual values for the vibration measurement and the second array is the corresponding time information (timestamp). For…
Chris S.
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