Struct DctBasis 

pub struct DctBasis {
    pub n: usize,
}

Discrete Cosine Transform (DCT-II) basis for sparse representation.

Signals with few significant DCT coefficients can be recovered from far fewer measurements than the Nyquist rate.

Fields

n: usize

Length of the signal (number of samples).

Implementations

impl DctBasis

pub fn new(n: usize) -> Self

Create a DCT basis for signals of length n.

pub fn transform(&self, x: &[f64]) -> Vec<f64>

Compute the forward DCT-II transform of x.

Returns a coefficient vector of the same length.

pub fn inverse(&self, coeffs: &[f64]) -> Vec<f64>

Compute the inverse DCT-II (i.e. DCT-III) transform of coeffs.

Reconstructs the original signal from its DCT coefficients.

pub fn truncate(&self, coeffs: &[f64], k: usize) -> Vec<f64>

Threshold DCT coefficients to keep only the k largest-magnitude ones.

Returns a truncated coefficient vector (all others set to zero).