# FFT(W) does not infer

**URL:** <https://discourse.julialang.org/t/fft-w-does-not-infer/36393>\
**Category:** General Usage\
**Tags:** fftw\
**Created:** [March 23, 2020, 2:12pm UTC](https://discourse.julialang.org/t/fft-w-does-not-infer/36393 "2020-03-23T14:12:41Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![raminammour](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raminammour/32/13572_2.png) [@raminammour](https://discourse.julialang.org/u/raminammour)\
**Post date:** [March 23, 2020, 6:22pm UTC](https://discourse.julialang.org/t/fft-w-does-not-infer/36393/12 "2020-03-23T18:22:48Z")

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I suspect the real culprit here to be `circcopy!`, see [Circcopy! does not infer for 3D arrays](https://discourse.julialang.org/t/circcopy-does-not-infer-for-3d-arrays/36401).

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