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Extrapolation: Porod Law

Extrapolate as: I(q) = B + Cp / q^4

class jldesmear.api.extrap_Porod.Extrapolation[source]

I(q) = B + Cp / q^4

calc(q)[source]
Parameters:q (float) – magnitude of scattering vector
Returns:value of extrapolation function at q
Return type:float
fit_add(reg, x, y, z)[source]

Add a data point to the statistics registers. Called from fit_loop().

Note:

might override in subclass

Parameters:
  • reg (obj) – statistics registers (created in fit()), instance of StatsRegClass
  • x (float) – independent axis
  • y (float) – dependent axis
  • z (float) – estimated uncertainty of y
fit_result(reg)[source]

Determine the results of the fit and store them as the set of coefficients in the self.coefficients dictionary. Called from fit().

Note:must override in subclass otherwise fit_result() will throw an exception
Parameters:reg (obj) – statistics registers (created in fit()), instance of StatsRegClass