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Hard to respond with no code showing an example. A guess: if the variable is `x` then add constraints `0
If you the objective allows all calculations to be performed in Mathematica (rather than reproduced in Excel), then using the Interpolation function works great: data = {{0., 0.}, {0.05, 0.4651}, {0.1, 0.6433}, {0.15, 0.7298}, {0.2, ...