My model is to Max Y

By changing variable X

Where:

X=B

and X<=X+C

It keeps telling me that "WARNING : The following constraint(s) do not appear to be linear", where I believe this warning is referring to X<=X+C. is it because it is circular reference?

Thank you. ]]>

I’m a frequent user of Open Solver, and very much appreciate all the work and effort you guys put in to it!

I currently working with the solver from VBA, and from here solving in a loop while adjusting the model with different target values. which overall works great. but I’m having an issue with the error message ‘no feasible solution’, is there any way from VBA to automate process of clicking “OK” to the error message? The error message itself is fine, I just need the solver to continue the script.

Kind regards,

Martin

I will definitely send a report to the CBC team. I truly appreciate your time and effort .

Br,

Vedran ]]>

I tried to use OpenSolver to develop a VBA script which would find all of the values needed to get a defined sum.

Since Frontline’s Excel Solver is limited to 200 variables and OpenSolver seems to be faster in some problems, it seemed to be a perfect tool. However, there’s a problem – OpenSolver with CBC seems to find no feasible solution, while Excel Solver has no issues with this type of problem.

Here’s a link to simple example of the problem in Excel file (with Frontline and OpenSolver solutions):

https://we.tl/t-h8QwQoe947

Looking forward to your answer,

Vedran