linear slope in onion model (Trac #695)

[sasview-bot]

Implement a linear slope for A ==0. Right now A ==0 gives a flat SLD profile given by SLDin, SLDout has no effect.

Migrated from http://trac.sasview.org/ticket/695

{
    "status": "closed",
    "changetime": "2017-04-11T11:42:48",
    "_ts": "2017-04-11 11:42:48.727111+00:00",
    "description": "Implement a linear slope for A ==0. Right now A ==0 gives a flat SLD profile given by SLDin, SLDout has no effect.",
    "reporter": "dirk",
    "cc": "",
    "resolution": "fixed",
    "workpackage": "SasModels Redesign",
    "time": "2016-10-05T15:13:41",
    "component": "sasmodels",
    "summary": "linear slope in onion model",
    "priority": "major",
    "keywords": "",
    "milestone": "SasView 4.2.0",
    "owner": "gonzalezm",
    "type": "enhancement"
}

[butlerpd]

Trac update at 2016/12/20 16:42:43:

• butler commented:

Moving to 4.2 due to lack of resources to achieve in a time and as not critical to 4.1

• butler changed milestone from "SasView 4.1.0" to "SasView 4.2.0"

[gonzalezma]

Trac update at 2017/04/06 14:28:32:

• gonzalezm commented:

This is OK, as it agrees with what the documentation says about the parameter A_k:
|A_k| > 0: exponential change between sld_in and sld_out
0 < |A_k| <<< 1 (e.g. A_k = 0.0001): linear change between sld_in and sld_out
A_k = 0: Use constant sld = sld_in for the whole shell. What it could be misleading is that in this case sld_out is not used, but this is clearly indicated in the documentation.

The only small bug is that the 'Show SLD profile' does not represent correctly the last case, as it keeps showing a linear change even when A_k = 0. I am going to fix this.

• gonzalezm changed owner from "dirk" to "gonzalezm"
• gonzalezm changed status from "new" to "assigned"

[ajj]

Trac update at 2017/04/11 11:42:48:

• ajj commented:

Closed by PR 40 on sasmodels.

Changeset [http://trac.sasview.org/changeset/587cbcd11accde4629ae70dea4e268ca5893f462/sasmodels 587cbcd]

• ajj changed resolution from "" to "fixed"
• ajj changed status from "assigned" to "closed"