Solver does not calculate the minimum


Board Regular
Apr 2, 2009
i have three different ranges:

BC1:BH1, contain values (f.e. yields)

CI1:CL1, contain some parameter values to start

CO1:CT1, each contains (different) formula using above CI1:CL1 parameters. Formula look like CI1+(CJ1-CI1)*(1-EXP(-0.5/CL1))/....

CN1, contains SUMMYXMY2(CO1:CT1, BC1:BH1)

i now use the solver with MIN:
target cell is CN1
modifiable cells are CI1:CL1

I now run the solver (i did it some more times, but does not change the results, since the parameters are to some extend calibrated). I now assume that the parameters (CI1:CL1) are changed to deliver the minimum of CN1, CN1 contains f.e. 2.1; with simply changing one of the parameters by hand (from -0,04 to -0,05) i decreased CN to 1.7; so the solved parameters by excel are obviously not the best minimum.

I was wondering that maybe i can change the accuracy of the solver. When i enter the options, accuracy is set to 1; When i press OK, i get the messagebox "accuracy has to be a small, positive value". I tried 0.1, 2, 0.5, always same messagebox.

anyone has an idea how to retrieve better results? what could be the reason for the bad parameters?

Thank you for any advice.
Last edited:

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