# \#nfft

**URL:** https://discourse.julialang.org/tag/nfft/798.md

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## [Help with NUFFT (NFFT) vs FFT in Radial MRI applications](https://discourse.julialang.org/t/help-with-nufft-nfft-vs-fft-in-radial-mri-applications/122106)

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**Author:** [@matividalg](https://discourse.julialang.org/u/matividalg)\
**Replies:** 0\
**Last updated:** [November 1, 2024, 12:52am UTC](https://discourse.julialang.org/t/help-with-nufft-nfft-vs-fft-in-radial-mri-applications/122106 "2024-11-01T00:52:02Z")

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Hi there! I have a few problems when generating a “fHat” matrix of a NFFT (using package NFFT) vs when dealing with the inverse fft of my own (imperfect) adquisition. Let me illustrate. I’m simulating a regular Gradient…

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## [Examples of FINUFFT?](https://discourse.julialang.org/t/examples-of-finufft/103708)

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**Author:** [@erny123](https://discourse.julialang.org/u/erny123)\
**Replies:** 4\
**Last updated:** [September 9, 2023, 9:51pm UTC](https://discourse.julialang.org/t/examples-of-finufft/103708 "2023-09-09T21:51:16Z")

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I’m trying to learn some basic Non-Uniform FFT. I want to see if I can get a frequency spectrum of a laser pulse with a NUFFT type 1 using the FINUFFT.jl library. Here’s the example: using FFTW using FINUFFT c = 2.99…

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## [Help needed with FFT and NFFT](https://discourse.julialang.org/t/help-needed-with-fft-and-nfft/93449)

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**Author:** [@Karajan](https://discourse.julialang.org/u/Karajan)\
**Replies:** 14\
**Last updated:** [February 12, 2023, 11:36am UTC](https://discourse.julialang.org/t/help-needed-with-fft-and-nfft/93449 "2023-02-12T11:36:10Z")

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Hi, I think I could use some help understanding nonuniform discrete Fourier transforms (NFFT). Either I’m not using the tools correctly or I’m misunderstanding how they work in general. I read that when my signal has no…

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## [FFT with variable sampling frequency](https://discourse.julialang.org/t/fft-with-variable-sampling-frequency/46288)

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**Author:** [@EmadMasroor](https://discourse.julialang.org/u/EmadMasroor)\
**Replies:** 11\
**Last updated:** [May 15, 2022, 9:51pm UTC](https://discourse.julialang.org/t/fft-with-variable-sampling-frequency/46288 "2022-05-15T21:51:56Z")

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Hello members of the Julia community, Is it possible to use the FFTW package (or any other Julia package) to perform an FFT on non-uniformly-sampled data? It seems that the functions provided in this package all assume …

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## [How to plot periodogram from DSP.jl?](https://discourse.julialang.org/t/how-to-plot-periodogram-from-dsp-jl/67969)

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**Author:** [@mdsa3d](https://discourse.julialang.org/u/mdsa3d)\
**Replies:** 5\
**Last updated:** [September 19, 2021, 10:07am UTC](https://discourse.julialang.org/t/how-to-plot-periodogram-from-dsp-jl/67969 "2021-09-19T10:07:12Z")

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I am trying to plot a periodogram for the following data. However, I am not sure how can i plot a periodogram object ? Code: #= DataFrame 10×10 DataFrame Row │ Date Open High Low Close Volume …

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## [Nonuniform fast Fourier transforms](https://discourse.julialang.org/t/nonuniform-fast-fourier-transforms/4858)

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**Author:** [@MikaelSlevinsky](https://discourse.julialang.org/u/MikaelSlevinsky)\
**Replies:** 10\
**Last updated:** [July 13, 2020, 11:10am UTC](https://discourse.julialang.org/t/nonuniform-fast-fourier-transforms/4858 "2020-07-13T11:10:04Z")

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FastTransforms.jl v0.2.2 includes nonuniform fast Fourier transforms thanks to Alex Townsend: nufft1 assumes uniform samples and noninteger frequencies; nufft2 assumes nonuniform samples and integer frequencies; nuf…