The code in here assumes it's passed a canonically-indexed array, but accepts any AbstractArray (and then accesses it out of bounds with @inbounds set).
x = OffsetArray(Complex{FourierTransforms.Float64}[1.0, 2.0], 0:1)
julia> FourierTransforms.plan_fft(x)*x
2-element OffsetArray(::Array{Complex{Float64},1}, 0:1) with eltype Complex{Float64} with indices 0:1:
2.300566222e-314 + 2.3005662377e-314im
2.0 + 2.2317219686e-314im
The fft functions in AbstractFFTs do transform the index space, but as shown above the plan interface gives garbage on OffsetArray.
The code in here assumes it's passed a canonically-indexed array, but accepts any
AbstractArray(and then accesses it out of bounds with@inboundsset).The
fftfunctions inAbstractFFTsdo transform the index space, but as shown above the plan interface gives garbage onOffsetArray.