adding support for F(Q) in sasmodels (Trac #491)

[butlerpd]

I(Q) is proportional to F(Q)^2^ Hence our models return that. However there are times when it may be preferable to have access to the F(Q). For example it is required for the beta approximation (increasing the range of applicability for using most current interaction potentials) or if one wanted to use these as a library for building P(Q) for more complex shapes.

Providing a method to access the underlying F(Q) thus would be very useful.

Migrated from http://trac.sasview.org/ticket/491

{
    "status": "assigned",
    "changetime": "2019-03-02T00:25:12",
    "_ts": "2019-03-02 00:25:12.521354+00:00",
    "description": "I(Q) is proportional to F(Q)^2^ Hence our models return that.  However there are times when it may be preferable to have access to the F(Q).  For example it is required for the beta approximation (increasing the range of applicability for using most current interaction potentials) or if one wanted to use these as a library for building P(Q) for more complex shapes.\n\nProviding a method to access the underlying F(Q) thus would be very useful.",
    "reporter": "butler",
    "cc": "",
    "resolution": "",
    "workpackage": "Beta Approximation Project",
    "time": "2015-12-19T19:07:45",
    "component": "sasmodels",
    "summary": "adding support for F(Q) in sasmodels",
    "priority": "major",
    "keywords": "",
    "milestone": "sasmodels 1.0",
    "owner": "wojciech",
    "type": "enhancement"
}

[butlerpd]

Trac update at 2016/03/20 22:41:08: butler changed milestone from "SasView 4.0.0" to "SasView Next Release +1"

[ajj]

Trac update at 2016/10/07 19:58:00: ajj changed description from:

I(Q) is proportional to F(Q)^2 Hence our models return that. However there are times when it may be preferable to have access to the F(Q). For example it is required for the beta approximation (increasing the range of applicability for using most current interaction potentials) or if one wanted to use these as a library for building P(Q) for more complex shapes.

Providing a method to access the underlying F(Q) thus would be very useful.

to:

I(Q) is proportional to F(Q)^2^ Hence our models return that. However there are times when it may be preferable to have access to the F(Q). For example it is required for the beta approximation (increasing the range of applicability for using most current interaction potentials) or if one wanted to use these as a library for building P(Q) for more complex shapes.

Providing a method to access the underlying F(Q) thus would be very useful.

[ajj]

Trac update at 2016/10/07 19:58:27:

• ajj changed owner from "" to "wojciech"
• ajj changed status from "new" to "assigned"

[pkienzle]

Trac update at 2018/10/30 22:20:27:

• pkienzle commented:

Supported in beta approximation branch of sasmodels.

External scripts that use sasmodels directly can call sasmodels.direct_model.call_Iq for I(Q) or sasmodels.direct_model.call_Fq for F(Q). For a structure factor calculation via the product model P@S, users can call calculator.results() to access the intermediates.

• pkienzle changed component from "SasView" to "sasmodels"
• pkienzle changed milestone from "SasView Next Release +1" to "sasmodels 1.0"

[butlerpd]

Trac update at 2019/03/02 00:25:12: butler changed workpackage from "SasModels Redesign" to "Beta Approximation Project"

[pkienzle]

Fixed in #90.