Fractional Cosine Transform

frct(signal, α, p)

Computing the α order fractional cosine transform of the input signal.

Example

julia> frct([1,2,3], 0.5, 2)
3-element Vector{ComplexF64}:
1.707106781186547 + 0.9874368670764581im
1.5606601717798205 - 1.3964466094067267im
-0.3535533905932727 - 0.6982233047033652im