Changeset 14a15a3 in sasmodels for sasmodels/kernelpy.py

Timestamp:

Aug 30, 2016 12:09:58 PM (8 years ago)

Author:

Paul Kienzle <pkienzle@…>

Branches:

master, core_shell_microgels, costrafo411, magnetic_model, release_v0.94, release_v0.95, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests

Children:

f54fb70

Parents:

3cd1001

Message:

treat normalization volume of 0. as 1., which mitigates n_shells=0 problem for spherical sld. Refs #635.

File:

• sasmodels/kernelpy.py (modified) (2 diffs)

sasmodels/kernelpy.py

@@ -187 +187 @@
     n_pars = len(parameters)
     parameters[:] = values[2:n_pars+2]
-    scale, background = values[0], values[1]
     if call_details.num_active == 0:
-        norm = float(form_volume())
-        if norm > 0.0:
-            return (scale/norm)*form() + background
-        else:
-            return np.ones(nq, 'd')*background
+        pd_norm = float(form_volume())
+        scale = values[0]/(pd_norm if pd_norm != 0.0 else 1.0)
+        background = values[1]
+        return scale*form() + background
 
     pd_value = values[2+n_pars:2+n_pars + call_details.num_weights]
@@ -245 +243 @@
             pd_norm += weight * form_volume()
 
-    if pd_norm > 0.0:
-        return (scale/pd_norm)*total + background
-    else:
-        return np.ones(nq, 'd')*background
+    scale = values[0]/(pd_norm if pd_norm != 0.0 else 1.0)
+    background = values[1]
+    return scale*total + background