`interpolate` fails if 'accidently applied twice'

IAMconsortium / pyam

Analysis & visualization of energy & climate scenarios

https://pyam-iamc.readthedocs.io/

Apache License 2.0

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Closed gidden closed 3 years ago

gidden commented 4 years ago

If the exact same interpolate call is used twice, the underlying data layout is appended in both wide and long.

Example code:

df.interpolate(2016) # works
df.interpolate(2016) # bad data now

Image attached interp

danielhuppmann commented 4 years ago

Interesting, because we do have a test specifically for calling that function twice...

danielhuppmann commented 4 years ago

@gidden could you make a PR with a test that fails with this specific issue?