Fix forecast output assignment and avoid SettingWithCopyWarning

[radim2tej]

Fix forecast output assignment and avoid SettingWithCopyWarning. Warnings were generated when using the energy price from the CSV file:
/app/src/emhass/forecast.py:1428: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
/app/src/emhass/forecast.py:1500: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[davidusb-geek]

Hi, thanks for the fix.
One quick question, why are you updating: cec_inverters.pbz2 and cec_modules.pbz2?

[radim2tej]

I don't know how that could have happened. I only edited forecast.py. Can you fix it? I'm not very good at it, unfortunately.

[davidusb-geek]

Ok I got it you were just updating from the master branch

[purcell-lab]

After the upgrade to 0.13.1 I am still seeing this issue:

#515

[2025-04-22 19:45:30 +1000] [23] [INFO] Performing naive MPC optimization
/app/src/emhass/forecast.py:1595: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
/app/src/emhass/forecast.py:1670: SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead
See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy
[2025-04-22 19:45:30 +1000] [23] [INFO] Perform an iteration of a naive MPC controller