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SpectralGradient loses normalization wavelength #457
Description
High-level problem description
Indexing an array of SpectralGraident values drops the normalization wavelength.
What did you do?
slopes = SpectralGradient(
np.arange(-5, 21) * u.percent / sbu.hundred_nm,
wave0=550 * u.nm,
)
print(slopes.wave0)
print(slopes[0].wave0)What did you expect?
550.0 nm
550.0 nm
What did really happen?
550.0 nm
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
Cell In[29], line 1
----> 1 print(slopes[0].wave0)
File ~/.venv/lib/python3.12/site-packages/astropy/units/quantity.py:1113, in Quantity.__getattr__(self, attr)
1108 """
1109 Quantities are able to directly convert to other units that
1110 have the same physical type.
1111 """
1112 if not self._include_easy_conversion_members:
-> 1113 raise AttributeError(
1114 f"'{self.__class__.__name__}' object has no '{attr}' member"
1115 )
1117 def get_virtual_unit_attribute():
1118 registry = get_current_unit_registry().registry
AttributeError: 'SpectralGradient' object has no 'wave0' member
Provide information on your environment:
operating system and version: linux
sbpy version: 0.6.1.dev16
astropy version: 8.0.0
numpy version: 2.5.2
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