Changeset c9fc873 in sasmodels
 Timestamp:
 Jul 9, 2018 7:13:35 AM (12 months ago)
 Branches:
 master, core_shell_microgels, magnetic_model, ticket1257vesicleproduct, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests
 Children:
 c11d09f
 Parents:
 751da81
 File:

 1 edited
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sasmodels/models/guinier.py
r751da81 rc9fc873 22 22 In scattering, the radius of gyration $R_g$ quantifies the objects's 23 23 distribution of SLD (not mass density, as in mechanics) from the objects's 24 centre of mass. It is defined by24 SLD centre of mass. It is defined by 25 25 26 .. math:: R_g^2 = \ sum_i^\text{all points}\rho_i\left(r_ir_0\right)^226 .. math:: R_g^2 = \frac{\sum_i\rho_i\left(r_ir_0\right)^2}{\sum_i\rho_i} 27 27 28 where $r_0$ denotes the object's centre of mass and $\rho_i$ is the SLD at a29 point $i$.28 where $r_0$ denotes the object's SLD centre of mass and $\rho_i$ is the SLD at 29 a point $i$. 30 30 31 31 Notice that $R_g^2$ may be negative (since SLD can be negative), which happens
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