Changeset fba204bf in sasview for src/sas/sascalc/pr

Timestamp:

Sep 4, 2018 11:34:41 AM (6 years ago)

Author:

wojciech

Branches:

ESS_GUI, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc

Children:

6701a0b

Parents:

d686ff1

Message:

Added error handling for missing errors

File:

• src/sas/sascalc/pr/invertor.py (modified) (3 diffs)

src/sas/sascalc/pr/invertor.py

@@ -144 +144 @@
         x, y, err, d_max, q_min, q_max and alpha
         """
-        if   name == 'x':
+        if name == 'x':
             if 0.0 in value:
                 msg = "Invertor: one of your q-values is zero. "
@@ -227 +227 @@
         return None
 
+    def add_errors(self, yvalues):
+        """
+        Adds errors to data set is they are not avaialble
+        :return:
+        """
+        stats_errors = np.zeros(len(yvalues))
+        for i in range(len(yvalues)):
+            # Scale the error so that we can fit over several decades of Q
+            scale = 0.05 * np.sqrt(yvalues[i])
+            min_err = 0.01 * yvalues[i]
+            stats_errors[i] = scale * np.sqrt(np.fabs(yvalues[i])) + min_err
+        return stats_errors
+
     def clone(self):
         """
@@ -245 +258 @@
         invertor.y = self.y
         invertor.err = self.err
+        if np.size(self.err) == 0 or np.all(self.err) == 0:
+            invertor.err = self.add_errors(self.y)
+        else:
+            invertor.err = self.err
         invertor.est_bck = self.est_bck
         invertor.background = self.background