With this one, since this is not linear, the linearity test should fail. I still don't know wether the linearity test can be done by merely changing the cell values. But this seems like the only case where the descent parser may be necessary. But again, I may still be over-complicating the problem...
Testing for linearity will be incomplete - you can only try a limited number of values. But after all, the user did assert the problem was linear, so why not believe them.
In return, the formula can then contain table lookups, user-defined (Basic) functions, add-in functions, you name it, just as long as the result is linear in relation to the input values. No amount of parsing will give you that.
Niklas
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