Created attachment 126062 [details] Simple but non-linear optimization problem. Optimizing a model with the linear solver, but the variables are multiplied with each other, making the model non-linear. Error message says 'model is infeasible', I think it should rather say that 'model is non-linear'. (When staring at a feasible solution, the 'infeasible' message is rather confusing.)
Confirmed. According to specification [1], this text comes from the solver engine, the appropriate one in this case would be "The model is not linear." [1] https://www.openoffice.org/specs/calc/features/Solver.odt
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Created attachment 137214 [details] Solver status message I tried the attachment and got following status message: "Process stopped at iteration 338 if 2000. Process stopped due to stagnation."
On pc Debian x86-64 with master sources updated today, I don't reproduce this. I got the same result as Thomas, except the number of iterations is slightly different.
Thomas, Julien, did you open Options... in the Solver dialog, and switch to LibreOffice (or LibreOfficeDev) Linear Solver?
(In reply to Aron Budea from comment #5) > Thomas, Julien, did you open Options... in the Solver dialog, and switch to > LibreOffice (or LibreOfficeDev) Linear Solver? Thank you Aron, I could reproduce the pb.
It seems "infeasible" may have different reasons (see http://lpsolve.sourceforge.net/5.5/). CoinMP also uses this expression.
I am not sure that linear solvers are capable to detect non-linearity. That is why I do not think that error messages should be changed.
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Bug still here as of 7.4.6.2 As I get older and wiser, I think it may be unreasonable to expect a linear solver to detect nonlinearity in the model. Maybe the error message should just hint that nonlinearity might be the problem?