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Excel 2010 Solver is ignoring constraints. I have a constraint for a range of cells "$E$13:$AE$13>=.000001". When I run Solver, it always ends up with one of the cells in this range being 0 or negative. I'm using "GRG Nonlinear", and have tested changing all the parameters for this option to no avail. Is this a problem others have seen or did I find the bug?
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If you wish: go to my website to get my email address and send me a sample file.
best wishes
I have adjusted the Constraint precision, and it makes no difference. The latest test had one of the values = -0.25350314825798, which is orders of magnitude greater than the constraint precision. I have clicked "Make Unconstrained Variables Non-Negative" on and off. I have clicked "Ignore Integer Constraints" on and off. I have clicked "Use Automatic Scaling" on and off. This problem has been repeated on several machines running Excel 2010.
To give a goo answer we would need to see the worksheet. Can you put a sample workbook on a fileshare site (OneDive, Dropbox...)
Best I can do without seeing you set up: have you looked in the Solver Options to we what you Constraint precision is set to?