# ForwardDiff and Zygote cannot automatically differentiate (AD) function from C^n to R that uses FFT

**URL:** <https://discourse.julialang.org/t/forwarddiff-and-zygote-cannot-automatically-differentiate-ad-function-from-c-n-to-r-that-uses-fft/52440>\
**Category:** Numerics\
**Created:** [December 27, 2020, 2:42am UTC](https://discourse.julialang.org/t/forwarddiff-and-zygote-cannot-automatically-differentiate-ad-function-from-c-n-to-r-that-uses-fft/52440 "2020-12-27T02:42:04Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![AshtonSBradley](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ashtonsbradley/32/11140_2.png) [@AshtonSBradley](https://discourse.julialang.org/u/AshtonSBradley)\
**Post date:** [March 22, 2022, 3:13am UTC](https://discourse.julialang.org/t/forwarddiff-and-zygote-cannot-automatically-differentiate-ad-function-from-c-n-to-r-that-uses-fft/52440/23 "2022-03-22T03:13:46Z")

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did you ever reach an acceptable solution for this?

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_[View the full topic](https://discourse.julialang.org/t/forwarddiff-and-zygote-cannot-automatically-differentiate-ad-function-from-c-n-to-r-that-uses-fft/52440)._