docs for magnetism need changing as they claim that magnetism only works for 5 models, when in fact they should now work for all discrete particles i.e. all of cylinder, ellipsoid, parallelepiped & sphere categories.

Magnetic sld's are automatically generated for any parameter name starting sld_.

Except need to check whether there are any pure python models - see #1048

Paul K said: The calculation works by setting the effective SLD for each particle SLD based on the spin and scattering angle of the neutron and the angle of the magnetic field for that SLD. The scattering patterns for the different spin states (++, +-, -+, —) are then added proportionally. Assuming uniform magnetism within each particle component, I see no reason that this wouldn't apply to all particle types.

The multiplicity models (onion, spherical_sld etc) when combined with magnetism ought to hide from the gui the magnetic parameters associated with unsused shells, at present the full maximum length list of sld_ parameters is appearing.

The code at present should function just fine, but may confuse the user with a long list of extra parameters.

In 4.2, load some 2d data, send it to fitpage, select sphere model, turn on magnetic, do compute or fit, then change model to core_shell_sphere, the fitpage will hang with error below, suspect a gui problem.

File "C:\sasview42\sasview\src\sas\sasgui\perspectives\fitting\fitpage.py", line 1258, in _on_select_model

self.get_paste_params(saved_pars)

File "C:\sasview42\sasview\src\sas\sasgui\perspectives\fitting\basepage.py", line 3260, in get_paste_params

check = item[1]

Indexerror: list index out of range