Changeset c9fc873 in sasmodels


Ignore:
Timestamp:
Jul 9, 2018 7:13:35 AM (12 months ago)
Author:
Torin Cooper-Bennun <torin.cooper-bennun@…>
Branches:
master, core_shell_microgels, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
Children:
c11d09f
Parents:
751da81
Message:

normalise R_g in guinier docs; use 'SLD centre of mass'

File:
1 edited

Legend:

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  • sasmodels/models/guinier.py

    r751da81 rc9fc873  
    2222In scattering, the radius of gyration $R_g$ quantifies the objects's 
    2323distribution of SLD (not mass density, as in mechanics) from the objects's 
    24 centre of mass. It is defined by 
     24SLD centre of mass. It is defined by 
    2525 
    26 .. math:: R_g^2 = \sum_i^\text{all points}\rho_i\left(r_i-r_0\right)^2 
     26.. math:: R_g^2 = \frac{\sum_i\rho_i\left(r_i-r_0\right)^2}{\sum_i\rho_i} 
    2727 
    28 where $r_0$ denotes the object's centre of mass and $\rho_i$ is the SLD at a 
    29 point $i$. 
     28where $r_0$ denotes the object's SLD centre of mass and $\rho_i$ is the SLD at 
     29a point $i$. 
    3030 
    3131Notice that $R_g^2$ may be negative (since SLD can be negative), which happens 
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