Changes in sasmodels/models/flexible_cylinder.py [db1d9d5:598a354] in sasmodels
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sasmodels/models/flexible_cylinder.py
rdb1d9d5 r598a354 33 33 and solvent respectively. 34 34 35 Our model uses the form factor calculations i n reference [1] as implemented in a36 c-library providedby the NIST Center for Neutron Research (Kline, 2006). This states:35 Our model uses the form factor calculations implemented in a c-library provided 36 by the NIST Center for Neutron Research (Kline, 2006). This states: 37 37 38 38 'Method 3 With Excluded Volume' is used. … … 41 41 pseudocontinuous limit. 42 42 See equations (13,26-27) in the original reference for the details. 43 44 .. note::45 46 There are several typos in the original reference that have been corrected47 by WRC [2]. Details of the corrections are in the reference below. Most notably48 49 - Equation (13): the term $(1 - w(QR))$ should swap position with $w(QR)$50 51 - Equations (23) and (24) are incorrect; WRC has entered these into52 Mathematica and solved analytically. The results were then converted to53 code.54 55 - Equation (27) should be $q0 = max(a3/(Rg^2)^{1/2},3)$ instead of56 $max(a3*b(Rg^2)^{1/2},3)$57 58 - The scattering function is negative for a range of parameter values and59 q-values that are experimentally accessible. A correction function has been60 added to give the proper behavior.61 62 63 **This is a model with complex behaviour depending on the ratio of** $L/b$ **and the64 reader is strongly encouraged to read reference [1] before use.**65 43 66 44 References … … 80 58 `flexible_cylinder.c <https://github.com/SasView/sasmodels/blob/master/sasmodels/models/flexible_cylinder.c>`_ 81 59 82 `wrc_cyl.c <https://github.com/SasView/sasmodels/blob/master/sasmodels/models/lib/wrc_cyl.c>`_83 84 60 Authorship and Verification 85 61 ---------------------------- 86 62 87 * **Author:** 88 * **Last Modified by:** 89 * **Last Reviewed by:** Steve King **Date:** March 26, 201963 * **Author:** 64 * **Last Modified by:** 65 * **Last Reviewed by:** 90 66 * **Source added by :** Steve King **Date:** March 25, 2019 91 67 """
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