Felix Hennings

Wrongly claimed infeasible model

2

Hi Highs-Team, I have a model that I'm pretty sure should be feasible, but Highs claims it's infeasible. Model (I added the `.txt` extension, so github allows the upload): [highs171_problem.lp.txt](https://github.com/ERGO-Code/HiGHS/files/14885963/highs171_problem.lp.txt)...

Re-solving a changed model with "direct" api results in wrong model being solved

1

Hi it's me again ^^ I found some strange behaviour using the `direct` api for `highs` in resolves. Example: Two simple models. The 1st is `max x` s.t. `x+y =0`,...

Hi, I encountered a problem using SCIP with the model attached as [linopy_pyscipopt_bug.txt](https://github.com/PyPSA/linopy/files/14837284/linopy_pyscipopt_bug.txt) (I used the extension `.txt` to allow the github update). Then the following code ``` import linopy...

Inconsistent coordinate override in arithmetic expressions

3

Based on the discussion in #256, I started using `.loc[indices]` in arithmetic expressions and observed some inconsistencies (or I still do not understand the behaviour to 100% ^^) Following setup:...

Improve documentation on overriding coordinates feature

8

Hi, I'm currently stuck trying to archive the following rather specific problem in linopy: ``` import linopy m = linopy.Model() # 2 days, hourly (48 hours) t = list(range(1,49)) n...

Incorrectly detected infeasibility when using presolve

5

Hi, the following model is incorrectly declared to be infeasible. If I turn off pre-solve a feasible solution is found. [highs_model_for_debugging.mps.txt](https://github.com/user-attachments/files/17255931/highs_model_for_debugging.mps.txt) Tested via highspy on versions `1.7.2` and branch `latest`....

Incorrectly detected infeasibility with pre-solve turned off

5

Hi, as a workaround to #1958 I started using HiGHS with pre-solve turned off. However, I found a model model for which infeasibility is reported when pre-solve is turned off:...

### Version Checks (indicate both or one) - [x] I have confirmed this bug exists on the lastest [release](https://github.com/pypsa/linopy/releases) of Linopy. - [ ] I have confirmed this bug exists...

Incorrectly detected infeasibility for non-default parameters

7

Hi, I currently use highs with `mip_feasibility_tolerance` of `1e-09` as a work around for #1958 and #1959 and encountered some inconsistent behaviour for the attached model [inconsistent_behaviour.mps.txt](https://github.com/user-attachments/files/17660333/inconsistent_behaviour.mps.txt) In default settings,...