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Questions on the use of Mathematica to construct models for approximating empirical data.

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How to fit piecewise functions with unknown domain?

/((Zphi - Z)^2 + (Rphi + R)^2))] - EllipticE[((4 R Rphi)/((Zphi - Z)^2 + (Rphi + R)^2))]) - EllipticK[((4 R Rphi)/((Zphi - Z)^2 + (Rphi + R)^2))])); Then the final function Msum is used for fitting … I have no idea about how to conduct the fitting using such a piecewise function. It will be appreciated if someone can help to improve this code. …
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