qt5 user level, changes to model tab

[richardh]

Consider adding "+" symbol drop downs with details for S(Q) radius & volume parameters, analogous to those for polydisperse radii.

[tcbennun]

Following today's conf call I'll focus on this approach.

[tcbennun]

opened JIRA issue:

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SASVIEW-967
tcbennun, 24 Jul 2018 16:05

As part of the greater beta approximation project, the following features shall be implemented in the Model tab of fit pages:

• In the parameter table, the S(Q) parameters radius_effective and volfraction shall have sub-items that allow user choice between generation from P(Q) model, or free/fitting.
• An option to enable the beta approximation for the current model shall be added.

These changes are compatible only with product models, i.e. a simple P(Q)*S(Q) model. The GUI additions here should leave room for the future support of mixture models with one or more products, i.e. (P_1(Q) + …)*S_1(Q) + (P_i(Q) + …)*S_2(Q) + …

In product models, the flag for enabling beta approximation will manifest as a model parameter with possible values of 0 or 1.

[tcbennun]

Example of enabled functional constraint in QT GUI, as child row of the parameter

[tcbennun]

Example of disabled functional constraint in QT GUI, as child row of the parameter

[tcbennun]

In ESS_GUI_beta_approx, added demonstration of what it may look like to choose between constraining effective_radius (for example) and letting it be a fittable parameter.

When constrained (I call it a 'functional constraint') to the value of some_func:

And when it is fittable/free:

Selecting a function to use as a constraint changes the row visually, and removes user-input values. It could enable the 'Value' column to show the calculated parameter, too.

[tcbennun]

Setting of product calculation mode in QT GUI.

[tcbennun]

A product calculation mode combo box has been added; it controls the beta_mode parameter injected into product models (only in the beta_approx sasmodels branch).

The possible options are taken from the limits field of the beta_mode parameter.

[tcbennun]

Note: the model is re-calculated immediately upon selection of a calculation mode.

[tcbennun]

After correspondence with Paul Kienzle, it looks appropriate to treat beta_mode as a normal model parameter, but one that has fixed choices and is not fittable. Such a parameter will be displayed in the GUI in the parameter table, but with a combo-box for selection. This approach allows for further addition of such fixed parameters; also, in the case of complicated mixture models where more than one product model is a constituent, the separate beta_mode parameters will be clear.

[tcbennun]

The beta mode parameter is now part of the parameter table (its location in the table is not yet fixed). It is a non-fittable (therefore non-checkable) parameter:

The possible options are P*S or P*(1+beta*(S-1)); these correspond internally to 0 or 1 (to turn beta mode off or on). It is perfectly easy to rename the parameter or add further options without breaking the GUI because it is treated generically.

[tcbennun]

The features detailed above in my previous comments are now merged into ESS_GUI.

Additionally, ESS_GUI_iss1052 has functionality for effective radius options, see #780.

Volume options will go down a similar route.