hyperspy._components.eels_double_power_law module

class hyperspy._components.eels_double_power_law.DoublePowerLaw(A=1e-05, r=3.0, origin=0.0, shift=20.0, ratio=1.0, left_cutoff=0.0, module='numexpr', compute_gradients=False, **kwargs)

Bases: hyperspy._components.expression.Expression

Double power law component for EELS spectra.

f(x) = A \cdot (s_r \cdot (x - x_0 - x_s)^{-r} + (x - x_0)^{-r})

Variable

Parameter

A

A

r

r

x_0

origin

x_s

shift

s_r

ratio
Parameters

  • A (float) – Height parameter.

  • r (float) – Power law coefficient.

  • origin (float) – Location parameter.

  • shift (float) – Offset of second power law.

  • ratio (float) – Height ratio of the two power law components.

  • **kwargs – Extra keyword arguments are passed to the Expression component.

The left_cutoff parameter can be used to set a lower threshold from which the component will return 0.

function_nd(axis)

Returns a numpy array containing the value of the component for all indices. If enough memory is available, this is useful to quickly to obtain the fitted component without iterating over the navigation axes.

grad_A(x)
grad_origin(x)
grad_r(x)
grad_ratio(x)
grad_shift(x)