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We would like to improve the numerical properties of the LPPs the message_ix sends to LP solvers. IMHO this requires a concerted treatment of at least the following issues:
1. Model specification: …
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I recently tried to install the new version of MESSAGEix with R use, but found the function "solve" do not completely work in R for the new version of model. In comparison, the "solve" function did wo…
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I've been fitting a few different gam models (in scripts/weight-at-age.R).
1) gam with no random effect (weight ~ s(age))
2) gam with year random effects, global smoother and same wiggliness acros…
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currently we might be changing both side of the dual linear equality constraints.
It is equivalent for most implementations, but it might be a bad way to go considering: https://www.gams.com/latest/d…
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Due to efficiency considerations in GAMS for storing sparse data, zero values in GDX files are ignored by default when loading data of a model. It seems for overcoming this issue, there are some _mapp…
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Hey @gavinsimpson,
congrats on your submission to JOSS! This is an issue coming out of the JOSS review [here](https://github.com/openjournals/joss-reviews/issues/6962). This looks like a great & ve…
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When running with a non-unit commitment version, there is a concern regarding gen_mingen. Code exists to address this issue, but it is not clear whether it effective. The code snippet for reference:
…
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In GitLab by @ererkka on Mar 30, 2020, 11:21
### Status and need
Some GAMS programs have a delicate directory structure, and the main file might not be in the root folder of the project. In case of …
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Dear Dr. Rosenberg,
My name is Najeeb Abusha'ar from the Jordan University of Science and Technology (JUST), Irbid, Jordan. I'm a masters student in Computer Science and I'm interested in your work…
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The currently used units result in values of variables reaching large orders of magnitude, e.g., 10^15 (total cost), 10^9 CO2 emission. This likely causes numerical problems, see e.g., popular explana…