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The ix modeling platform for integrated and cross-cutting scenario analysis

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Another issue which I have encountered, but which I havent been able to replicate: When a scenario has been run, an error occurs where the scenario is not checked when...

backend.jdbc

Copied from #108. - Some of these would require backwards-incompatible renaming of methods (e.g. items 3, 6) and would need to occur in the next major version (1.0) - Some...

#### Code sample or context Add timeseries to the scenario with unit names represented by numbers (e.g. 1). #### Expected result Timeseries added to the scenario without error. #### Problem...

enh
help welcome

The Java code in iiasa/ixmp_source that underlies JDBCBackend raises a variety of exceptions. JDBCBackend itself has to catch, inspect, and re-raise these in order to give [standard Python exceptions](https://docs.python.org/3/library/exceptions.html#concrete-exceptions)—for instance,...

enh
backend.jdbc

Whenever possible switch to using categorical dtypes instead of object, at it allows to significantly reduce memory utilization when number of repeated values in a column is more than 50%....

backend.jdbc

Use [pytest-benchmark](https://pytest-benchmark.readthedocs.io) or similar tools to test performance metrics. The ixmp unit tests use simple models like the Dantzig cannery/transport problem to quickly test basic features. However, ixmp is also...

enh
ci

The function `add_timeseries()` ignores the columns model and scenario when data is added to a scenario. This just led me to inadvertently upload a dataframe with data from multiple scenarios,...

when I run py.test in ixmp directory it gives me failure on test_check_multi_model_access . I am attaching the error note as a notepad for your review @zikolach [test_access failure.txt](https://github.com/iiasa/ixmp/files/4107575/test_access.failure.txt)

When trying to modify a scenarios with a solution, it throws an error saying: ```at.ac.iiasa.ixmp.exceptions.IxExceptionPyRaisable: at.ac.iiasa.ixmp.exceptions.IxException: This Scenario has elements in a variable or equation! Use 'removeSolution()' or clone(False)'before editing!```...

bug
good first issue

@behnam-zakeri reports trying the following: ``` import ixmp ixmp.Platform(jvmargs=['-Xfoo']) ``` The intent is to load the default platform (i.e. to imply name='default'), and then pass the *jvmargs* to JDBCBackend. However,...

enh
help welcome