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dct

zenith_float_num

Function dct 

Source 
pub fn dct(
    signal: &ExactNumArray,
    p: usize,
    rm: RoundingMode,
    cc: &mut Consts,
) -> Option<ExactNumArray>
Expand description

Discrete cosine transform, type II, via a 2N-point FFT.

X_k = Σ_n x_n cos(π(n+1/2)k/N). Input is a real row or column. N must be a power of two and at most DSP_MAX_POINTS. Empty, non-finite, or a bad shape returns None.