Changeset d1cfa86 in sasmodels

Timestamp:

Oct 28, 2016 10:26:31 AM (7 years ago)

Author:

smk78

Branches:

master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests

Children:

3a45c2c

Parents:

9cc7fca

Message:

Added note to the model description about the behaviour of S(q) & Gamma
at certain values of Df (email thread between PaulK, RichardH & SteveK).

File:

• sasmodels/models/fractal.py (modified) (1 diff)

sasmodels/models/fractal.py

@@ -30 +30 @@
 
 where $\xi$ is the correlation length representing the cluster size and $D_f$
-is the fractal dimension, representing the self similarity of the structure.
+is the fractal dimension, representing the self similarity of the structure. 
+Note that S(q) here goes negative if $D_f$ is too large, and the Gamma function 
+diverges at $D_f$=0 and $D_f$=1.  
 
 **Polydispersity on the radius is provided for.**