Function ihfft 

pub fn ihfft<T>(
    x: &[T],
    n: Option<usize>,
    norm: Option<&str>,
) -> FFTResult<Vec<Complex64>>
where
    T: NumCast + Copy + Debug + 'static,

Compute the 1-dimensional inverse Hermitian FFT.

This function computes the inverse FFT of real-valued input, producing a Hermitian-symmetric complex output (where a[i] = conj(a[-i])).

Arguments

• x - Input real-valued array
• n - Length of the transformed axis (optional)
• norm - Normalization mode (optional, default is “backward”):
  • “backward”: No normalization on forward transforms, 1/n on inverse
  • “forward”: 1/n on forward transforms, no normalization on inverse
  • “ortho”: 1/sqrt(n) on both forward and inverse transforms

Returns

• The Hermitian-symmetric complex FFT of the real input array

Examples

use scirs2_fft::hfft::ihfft;

// Create a real-valued array
let x = vec![5.0, -1.0, 2.0];

// Compute the IHFFT (resulting in a complex array with Hermitian symmetry)
let result = ihfft(&x, None, None).unwrap();

// Verify Hermitian symmetry properties
assert_eq!(result.len(), 3);
assert!(result[0].im.abs() < 1e-10); // DC component should be real