FunctionQDepends

Description

This fitting function is the base class for all fitting functions that have:

  • A range of energy transfers as their one-dimensional domain from which to take values
  • The magnitude of the momemtum transfer, Q, as one of their attributes.

Fitting functions for QENS data depending on Q should derive from this class.

There are two ways to update attribute Q in the fit funtion:

  • The user inputs a particular value.
  • The spectrum contains Q in addition to the range of energy transfers.

Conflict may arise when both options are available. In that case, priority is given to the Q-value contained in the spectrum. Here are some user cases:

  • User cannot override the value of attribute Q if the spectrum contains a Q-value.
  • User can set or update the value of of attribute Q is the spectrum does not contain a Q-value.
  • The value of attribute Q will be updated everytime we pass a new spectrum containing a Q-value.
  • The value of attribute Q will be erased if we pass a new spectrum not containing a Q-value. In this case it is the responsability of the user to set the appropriate value.