Return a copy of an R object with its class set to a given type of spectrum.
See also
Other constructors of spectral objects:
as.chroma_spct()
,
as.cps_spct()
,
as.filter_spct()
,
as.generic_spct()
,
as.object_spct()
,
as.raw_spct()
,
as.reflector_spct()
,
as.response_spct()
,
as.solute_spct()
,
as.source_spct()
,
source_spct()