[Pw_forum] fft 3D

[Fang Liu]

Dear all,

I found that the fft and invfft in PW are specified for wavefunctions.
The dual space technique is used. In real space, the wavefunction is a real
vector.

I want to write some code using 3D fft (forward and backward) in Quantum
Espresso
for general complex vector (stored in 3D array).

Could you please give me some suggestions?
Thank you in advance.

Best,
Fang
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