Parameters   Defaults

FPOL order         0
     /
     EXP(exporder)
     SQRT         

Purpose

  Specify a polynomial fit function.

Example

  FPOL 1

  defines a fit function y(x) = p1 + p2 * x

  FPOL 1 / SQRT

  defines a fit function y(x) = sqrt(p1 + p2 * x)

  FPOL 1 / EXP(2)

  defines a fit function y(x) = ( p1 + p2 * x ) * exp( p3 * x + p4 * x * x )

Order of polynomial. The number of parameters is order+1.

The basic polynomial is multiplied with the exponential of another
polynomial of order exporder, without the constant term.

The fit function is the square root of the basic polynomial.