First of all great work on building this awesome tool.

I have been trying to develop a supply planning problem in Open solver, for the period Jan to December. However, as I keep adding the variables beyond a limit, when the Variable cells dialog box is almost full, it throws an error saying “The cell range specified is invalid. This must be a valid excel range that does not exceed Excel’s internal character count limits.” Any work around for this or is this a limitation?

I’m using NOMAD optimization to maximize the sum of 500 functions which have the following equation F(x)=a*ln(x)+b. I have put many constrains. When I press solve the does many iterations 10,000 and delays a lot to converge within “Distance to feasibility”. Is there something I can do to speed this up?

Thanks for your great Solver!

Alex

I am having an issue with Solver running extremely slow and never getting past the “building model” stage – it just continually starts over. This is the first time that I have encountered this issue. It has been running fine up to this point. ]]>