Function wp_reconstruct 

pub fn wp_reconstruct(
    tree: &WaveletPacketTree,
    basis_nodes: &[WaveletPacketNode],
) -> Result<Vec<f64>, FFTError>

Reconstruct the signal from a set of wavelet packet nodes forming a basis.

The nodes must constitute a valid partition of the time-frequency plane (e.g. those returned by best_basis). Mixed-level bases (where some nodes are at depth 2 and others at depth 3, etc.) are fully supported.

Arguments

• tree – The original packet tree (provides wavelet & signal length).
• basis_nodes – A valid wavelet packet basis (partition of the root).

Errors

Returns FFTError::InternalError if reconstruction encounters a missing node.

Example

use scirs2_fft::wavelet_packets::{wpd, best_basis, wp_reconstruct, shannon_entropy, Wavelet};

let signal: Vec<f64> = (0..64).map(|i| (i as f64 * 0.1).sin()).collect();
let tree = wpd(&signal, Wavelet::Haar, 3).expect("decomp");
let basis = best_basis(&tree, shannon_entropy).expect("basis");
let recon = wp_reconstruct(&tree, &basis).expect("recon");
assert_eq!(recon.len(), signal.len());
// Perfect reconstruction (approx)
for (a, b) in signal.iter().zip(recon.iter()) {
    assert!((a - b).abs() < 1e-10, "mismatch: {} vs {}", a, b);
}