Changeset 2c4a190 in sasmodels for example/multiscatfit.py

Timestamp:

Dec 13, 2018 9:08:26 AM (5 years ago)

Author:

Paul Kienzle <pkienzle@…>

Branches:

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

Children:

8803a38

Parents:

c6084f1

Message:

simplify use of multiple scattering in bumps fits

File:

• example/multiscatfit.py (modified) (3 diffs)

example/multiscatfit.py

@@ -15 +15 @@
 
     # Show the model without fitting
-    PYTHONPATH=..:../explore:../../bumps:../../sasview/src python multiscatfit.py
+    PYTHONPATH=..:../../bumps:../../sasview/src python multiscatfit.py
 
     # Run the fit
-    PYTHONPATH=..:../explore:../../bumps:../../sasview/src ../../bumps/run.py \
+    PYTHONPATH=..:../../bumps:../../sasview/src ../../bumps/run.py \
     multiscatfit.py --store=/tmp/t1
 
@@ -55 +55 @@
     )
 
+# Tie the model to the data
+M = Experiment(data=data, model=model)
+
+# Stack mulitple scattering on top of the existing resolution function.
+M.resolution = MultipleScattering(resolution=M.resolution, probability=0.)
+
 # SET THE FITTING PARAMETERS
 model.radius_polar.range(15, 3000)
@@ -65 +71 @@
 model.scale.range(0, 0.1)
 
-# Mulitple scattering probability parameter
-# HACK: the probability is stuffed in as an extra parameter to the experiment.
-probability = Parameter(name="probability", value=0.0)
-probability.range(0.0, 0.9)
+# The multiple scattering probability parameter is in the resolution function
+# instead of the scattering function, so access it through M.resolution
+M.scattering_probability.range(0.0, 0.9)
 
-M = Experiment(data=data, model=model, extra_pars={'probability': probability})
-
-# Stack mulitple scattering on top of the existing resolution function.
-# Because resolution functions in sasview don't have fitting parameters,
-# we instead allow the multiple scattering calculator to take a function
-# instead of a probability.  This function returns the current value of
-# the parameter. ** THIS IS TEMPORARY ** when multiple scattering is
-# properly integrated into sasmodels and sasview, its fittable parameter
-# will be treated like the model parameters.
-M.resolution = MultipleScattering(resolution=M.resolution,
-                                  probability=lambda: probability.value,
-                                  )
-M._kernel_inputs = M.resolution.q_calc
+# Let bumps know that we are fitting this experiment
 problem = FitProblem(M)