Spectrum 1D concept & issues

Spectrum1D API concepts and issues

Implementation questions

Instantiator

• two main suggestions: instantiation with a flux & a dispersion array OR a flux array and a WCS object

• suggested WCS implementation:

https://github.com/wkerzendorf/specutils/blob/specio/specutils/io/io_utils.py

https://github.com/wkerzendorf/specutils/blob/specwcs/specutils/specwcs/specwcs.py

Slicing

• slicing can work on either dispersion or pixels

• keyword to switch between both of them

• getitem overload?

arithmetic

• operator overload?

if operator overload

• what operands allowed? scalars, spectrum same dispersion, spectrum different dispersion
• op-mode setting in spectrum1d

interpolator

• for now simple np.interp?
• thinking about interpolation using wcs?

API questions

Copy vs inplace

• meta data copy -- time intensive?

• pythonic to do copy?

methods vs functions

• when to use functions, when spectrum1d internal methods.

• argument plotting

• argument io

Issues outside the Spectrum1D discussion

Error

Mask