![]() There is no knowledge built into that variable of how it was calculated, it's just a box with a number in it. ![]() C# is basically procedural within the body of a method, so making an assignment statement fn = some terms happens once, when the program hits that line. In the box labeled Set Target Cell type in G4. (It looks as though you were expecting C# to work with symbolic mathematics, which isn't the case. add-in in Excel to find the values of A, C and k that result in the minimum value for 2 i i (cell G4) Procedure to Fit the Data 1. I think the solution is to move the second, third and fourth lines inside the loop. 3) If possible, try to avoid nonsmooth and discontinuous functions such as IF, MAX, MIN, and LOOKUP. ![]() Also, bound to avoid division by zero can help keep the solver out of numerically difficult spots. I expect that you intended fdn and dfn to be updated on each iteration - although your pseudocode statement of the method is ambiguous since it implies that only the whole solution is updated on each iteration, whereas actually each term needs to be updated or you'll just keep adding the starting value of ∆xn forever. Adding reasonably tight upper and lower bound constraints on your variables can help keep the solver from wasting time in unfruitful regions. I'm sure I've actually implemented a Newton-Raphson method myself years ago, but I don't remember enough about it to check that your arithmetic is correct without looking it up. Your loop performs the same calculation each time, because neither a or dfn change between iterations.
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