Solving Multiple Polynomials

Question

Solving Multiple Polynomials

TypeIV (Structural)

(OP)

29 Dec 04 12:08

I am trying to write an concrete column interaction spreadsheet and I need to solve several cubic equations at once.

Should I use GOALSEEK or SOLVER? How do I get the spreadsheet to solve more that one equation at a time?

Thanks

GregLocock (Automotive) · Answer 1 · 2004-12-29 18:01:29

You should use solver. Set up a cell that contains your total RMS error for all the sub-problems, and then get solver to minimise that. You may need to apply weightings to the individual error terms.

Goal seek won't work, it can only change one cell to drive another cell towards a target value. You need to change multiple cells.

Another option that might work better is to solve each cubic individually with solver, driving that from a macro.

Cheers

Greg Locock

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Solving Multiple Polynomials