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, , as one of their attributes.

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

There are two ways to update attribute in the fit function:

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

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

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