BrowserUk,
I think I understand now. The financial stuff you were talking about was probably some form of regression analysis using the least squares method. I don't think that would work for your problem because your lines curve back under themselves though you might treat them as a few lines and have it work.

My apologies for not providing anything more concrete but a post to one of the math related reddits may provide insight (/r/math, /r/learnmath, /r/matheducation, /r/EngineeringStudents, /r/AskEngineers

Cheers - L~R

In reply to Re^3: Graphics math. by Limbic~Region
in thread Graphics math. by BrowserUk

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