# `Macaw.Data.Operations.Transforms.Spectrum`
[🔗](https://github.com/dcoai/macaw_data/blob/v0.5.3/lib/macaw/data/operations/transforms/series.ex#L208)

`spectrum` (spec/04 §4.11): a time series to its one-sided amplitude spectrum by FFT
(`Macaw.Data.FFT.spectrum/3`). The interval is `every`, else the median positive gap of
the `time` column, else 1; the samples are the newest power of two rows with a numeric
reading of `field`; each row holds `as`'s names for the frequency and the magnitude, and
a third, when `as` gives one, for the phase.

---

*Consult [api-reference.md](api-reference.md) for complete listing*