iiasa/ixmp

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

Stars: 39
Forks: 113
Open beginner issues: 0
Indexed issues: 66
Avg merge: 2d 21h
Merged PRs (30d): 2

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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66 open issues indexed

Address warnings with recent Java + JPype Open

awaiting info backend.jdbc

Difficulty 4/5 3-5 days Newbie friendliness 45/100

iiasa/ixmp#652 · Opened Sep 9, 2026
ixmp is not compatible with the latest ixmp4 releases Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

iiasa/ixmp#642 · 1 comment · Opened Jun 11, 2026
Bump docs requirements prior to 3.12 release Open

docs

iiasa/ixmp#631 · 1 assignee · Opened Mar 27, 2026
Address CI errors due to pandas 3.0.1 and reticulate 1.45.0 Open

bug ci R

Difficulty 3/5 1-2 days Newbie friendliness 25/100

iiasa/ixmp#628 · 1 comment · Opened Feb 18, 2026
Formalize index behaviour of CachingBackend Open

awaiting info backend.ixmp4 backend.jdbc

Difficulty 4/5 3-5 days Newbie friendliness 38/100

iiasa/ixmp#619 · 2 comments · Opened Dec 10, 2025
Ensure dtypes of Parameter data are handled consistently on IXMP4Backend Open

awaiting info

Difficulty 4/5 3-5 days Newbie friendliness 30/100

iiasa/ixmp#618 · Opened Dec 10, 2025
UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

iiasa/ixmp#609 · Opened Nov 11, 2025
Ensure JDBC-compatibility of pre-defined values on IXMP4Backend Open

backend.ixmp4

Difficulty 4/5 3-5 days Newbie friendliness 38/100

iiasa/ixmp#608 · 1 comment · 1 reaction · Opened Nov 7, 2025
Implement cloning of Scenario from JDBC to IXMP4Backend Open

backend.ixmp4 backend.jdbc

iiasa/ixmp#606 · 1 comment · 1 assignee · Opened Oct 30, 2025
Errors because of the ixmp4 pin Open

backend.ixmp4

Difficulty 3/5 1-2 days Newbie friendliness 38/100

iiasa/ixmp#600 · 1 reaction · Opened Oct 13, 2025
ixmp4.core.exceptions.RunLockRequired Open

backend.ixmp4

Difficulty 4/5 3-5 days Newbie friendliness 25/100

iiasa/ixmp#595 · Opened Sep 2, 2025
message-ix on Windows server cannot find GAMS (show-versions fails) Open

awaiting info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#590 · 1 comment · Opened Jul 26, 2025
Clone between JDBCBackend vs. IXMP4Backend Open

backend.ixmp4 backend.jdbc enh

Difficulty 4/5 3-5 days Newbie friendliness 28/100

iiasa/ixmp#588 · 1 comment · Opened Jul 24, 2025
Show more explicit/verbose failure information for expired GAMS license Open

enh

iiasa/ixmp#584 · 1 assignee · Opened Jun 23, 2025
`show_versions()` give same/erroneous git info for some packages Open

bug

iiasa/ixmp#583 · 1 assignee · Opened Jun 23, 2025
Workaround `gamsapi` dependency bound on pandas <2.3 Open

backend.ixmp4

Difficulty 4/5 3-5 days Newbie friendliness 32/100

iiasa/ixmp#582 · 4 comments · Opened Jun 9, 2025
Extend IXMP4Backend Open

backend.ixmp4 enh

Difficulty 5/5 Over a week Newbie friendliness 25/100

iiasa/ixmp#574 · Opened May 9, 2025
Scenario.add_par("duration_period", …) has no effect with JDBCBackend Open

backend.jdbc bug wontfix

Difficulty 4/5 3-5 days Newbie friendliness 25/100

iiasa/ixmp#567 · Opened Apr 11, 2025
Make more tests robust and independent Open

ci

Difficulty 4/5 3-5 days Newbie friendliness 25/100

iiasa/ixmp#546 · 14 comments · Opened Sep 26, 2024
Minor errors in the 2nd part of our transport tutorial Open

bug docs good first issue

Difficulty 1/5 Under an hour Newbie friendliness 35/100

iiasa/ixmp#540 · Opened Aug 28, 2024
Address failing tests of R/Jupyter notebooks Open

ci

Difficulty 3/5 1-2 days Newbie friendliness 45/100

iiasa/ixmp#467 · Opened Dec 5, 2022
Work around conda-forge/openjdk-feedstock#107 Open

backend.jdbc

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#462 · Opened Oct 19, 2022
Editable install not working Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

iiasa/ixmp#460 · 14 comments · Opened Oct 11, 2022
Scenario.timeseries() not working when using transact() or check_out() Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

iiasa/ixmp#453 · 2 comments · Opened Jul 28, 2022
How to remove a variable from a scenario? Open

discuss enh

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#452 · 1 comment · Opened Jul 27, 2022
Configure notifications for cron triggered workflows Open

ci enh

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#439 · 1 comment · Opened Mar 21, 2022
Defining regions and changing their attributes Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#438 · Opened Mar 2, 2022
read-only scenario opening Open

backend.jdbc enh

Difficulty 5/5 Over a week Newbie friendliness 25/100

iiasa/ixmp#437 · 10 comments · Opened Feb 18, 2022
Warn/work around Java issues with tr_TR locale Open

backend.jdbc bug docs

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#436 · 9 comments · Opened Feb 10, 2022
Scenario.read_excel() fails on sheets containing 'phantom' cells Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

iiasa/ixmp#432 · 1 comment · Opened Jan 24, 2022
2-platform local clone() exhausts memory Open

backend.jdbc bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

iiasa/ixmp#423 · 1 comment · Opened Jul 22, 2021
Test Scenario update using Model.initialize() Open

enh

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

iiasa/ixmp#419 · Opened May 27, 2021
Resolve Windows access violations in JDBCBackend Open

backend.jdbc bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

iiasa/ixmp#411 · Opened Apr 5, 2021
Update a subset of data through Scenario.read_excel() Open

enh

Difficulty 5/5 Over a week Newbie friendliness 35/100

iiasa/ixmp#409 · 1 comment · Opened Mar 25, 2021
Increase test coverage to 100% Open

enh help welcome

Difficulty 5/5 Over a week Newbie friendliness 20/100

iiasa/ixmp#386 · Opened Nov 22, 2020
List/add default units of a Platform Open

enh

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#384 · Opened Nov 18, 2020
unable to delete scenario Open

backend.jdbc bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

iiasa/ixmp#382 · 11 comments · Opened Nov 18, 2020
Java Error raised when loading older scenarios Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

iiasa/ixmp#381 · Opened Nov 2, 2020
Progress indicator/logger for exports Open

enh

Difficulty 4/5 3-5 days Newbie friendliness 35/100

iiasa/ixmp#365 · 1 comment · 1 reaction · Opened Aug 26, 2020
Error if use number-like unit name when adding timeseries Open

enh help welcome

Difficulty 3/5 1-2 days Newbie friendliness 35/100

iiasa/ixmp#346 · 3 comments · Opened Jul 7, 2020
Warn for non-unique model-scenario index when adding timeseries Open

iiasa/ixmp#311 · 1 assignee · Opened Apr 10, 2020
Add Scenario.to_csv() method Open

enh help welcome

Difficulty 3/5 1-2 days Newbie friendliness 35/100

iiasa/ixmp#300 · 2 comments · Opened Mar 31, 2020
Raise Pythonic exceptions in JDBCBackend Open

backend.jdbc enh

Difficulty 4/5 3-5 days Newbie friendliness 45/100

iiasa/ixmp#296 · 1 reaction · Opened Mar 27, 2020
Harmonize handling of codelists Open

enh

Difficulty 5/5 Over a week Newbie friendliness 25/100

iiasa/ixmp#274 · 1 comment · Opened Mar 5, 2020
Export scenario to gdx Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

iiasa/ixmp#259 · 6 comments · Opened Jan 26, 2020
Platform.__init__() with backend_args= but without name= Open

enh help welcome

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

iiasa/ixmp#255 · 1 comment · Opened Jan 15, 2020
Units of historical parameters when cloning Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

iiasa/ixmp#241 · Opened Dec 19, 2019
Copying parameters results in additional decimals places Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

iiasa/ixmp#235 · 5 comments · Opened Dec 11, 2019
Return categorical dtypes from (JDBC)Backend to reduce memory usage Open

backend.jdbc

Difficulty 4/5 3-5 days Newbie friendliness 45/100

iiasa/ixmp#228 · 1 comment · Opened Nov 28, 2019
Discuss greedy/prefetch caching behaviour Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

iiasa/ixmp#222 · Opened Nov 25, 2019

iiasa/ixmp

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