Function irfft 

pub fn irfft<T>(x: &[T], n: Option<usize>) -> FFTResult<Vec<f64>>
where
    T: NumCast + Copy + Debug + 'static,

Compute the inverse of the 1-dimensional discrete Fourier Transform for real input.

Arguments

• x - Input complex-valued array representing the Fourier transform of real data
• n - Length of the output array (optional)

Returns

• The inverse Fourier transform, yielding a real-valued array

Examples

use scirs2_fft::{rfft, irfft};
use scirs2_core::numeric::Complex64;

// Generate a simple signal
let signal = vec![1.0, 2.0, 3.0, 4.0];

// Compute RFFT of the signal
let spectrum = rfft(&signal, None).unwrap();

// Inverse RFFT should recover the original signal
let recovered = irfft(&spectrum, Some(signal.len())).unwrap();

// Check that the recovered signal matches the original
for (i, &val) in signal.iter().enumerate() {
    assert!((val - recovered[i]).abs() < 1e-10);
}