Changeset 2cce133 in sasview for Invariant

Timestamp:

Nov 24, 2009 4:51:01 PM (14 years ago)

Author:

Gervaise Alina <gervyh@…>

Branches:

master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, release_4.0.1, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload

Children:

2733188

Parents:

669aaf9

Message:

add more comments

File:

• Invariant/invariant.py (modified) (2 diffs)

Invariant/invariant.py

@@ -317 +317 @@
               Compute the surface given by:
                 surface = (2*pi *V(1- V)*porod_const)/ q_star
-                
+               
             @param contrast: contrast value to compute the volume
             @param porod_const: Porod constant to compute the surface 
-            @return: specific surface
+            @return: specific surface 
         """
        
@@ -418 +418 @@
     def get_volume_fraction_with_error(self, contrast):
         """
-            Compute uncertainty on volume value.
+            Compute uncertainty on volume value as well as the volume fraction
             This uncertainty is given by the following equation:
             dV = 0.5 * (4*k* dq_star) /(2* math.sqrt(1-k* q_star))
                                  
             for k = 10^(8)*q_star/(2*(pi*|contrast|)**2)
+            
             q_star: the invariant value including extrapolated value if existing
             dq_star: the invariant uncertainty
             dV: the volume uncertainty
             @param contrast: contrast value 
-            @return: v, dv
+            @return: V, dV = self.get_volume_fraction_with_error(contrast), dV
         """
         
     def get_surface_with_error(self, contrast, porod_const):
         """
-            Compute uncertainty of the surface value.
+            Compute uncertainty of the surface value as well as thesurface value
             this uncertainty is given as follow: