I did something like this for EBay.  I defined a hierarchy of Equation classes, 
including linear, nth order polynomials, power law.  The base Equation class 
provided common functionality such as data initialization and solving for the 
unknown gien a variable.  Applications could then be written that called the 
library function in real time, so a mouse could be tracked while live X and Y 
intercepts were displayed, etc.  Sorry I can't offer the source code.  
Hopefully this gives you an idea of how you might proceed.


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