Function fftn 

pub fn fftn<T>(
    input: &ArrayD<T>,
    shape: Option<Vec<usize>>,
    axes: Option<Vec<usize>>,
    norm: Option<&str>,
    _overwrite_x: Option<bool>,
    _workers: Option<usize>,
) -> FFTResult<ArrayD<Complex64>>
where
    T: NumCast + Copy + Debug + 'static,

Compute the N-dimensional Fast Fourier Transform

Arguments

• input - Input N-dimensional array
• shape - Shape of the output (optional)
• axes - Axes along which to compute the FFT (optional)
• norm - Normalization mode: “backward”, “ortho”, or “forward” (optional)
• overwrite_x - Whether to overwrite the input array (optional)
• workers - Number of worker threads to use (optional)

Returns

An N-dimensional array of complex values representing the FFT result

Examples

use scirs2_fft::fftn;
use scirs2_core::ndarray::{Array, IxDyn};

// Create a 3D array
let mut data = Array::zeros(IxDyn(&[2, 2, 2]));
data[[0, 0, 0]] = 1.0;
data[[1, 1, 1]] = 1.0;

// Compute the N-dimensional FFT
let result = fftn(&data, None, None, None, None, None).unwrap();

// Check dimensions
assert_eq!(result.shape(), &[2, 2, 2]);