Refs #8819 Throw more verbose error during reduction.

mantidproject · Feb 10, 2014 · f275a83 · f275a83
1 parent d85ec79
commit f275a83
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/Code/Mantid/scripts/Inelastic/inelastic_indirect_reduction_steps.py b/Code/Mantid/scripts/Inelastic/inelastic_indirect_reduction_steps.py
@@ -147,8 +147,11 @@ def _load_single_file(self, filename, output_ws):
             else:
                 ## Extract Monitor Spectrum
                 ExtractSingleSpectrum(InputWorkspace=ws,OutputWorkspace= ws+'_mon',WorkspaceIndex= self._monitor_index)
-                ## Crop the workspace to remove uninteresting detectors
 
+                if self._detector_range_start < 0 or self._detector_range_end > mtd[ws].getNumberHistograms():
+                    raise ValueError("Range %d - %d is not a valid detector range." % (self._detector_range_start, self._detector_range_end))
+
+                ## Crop the workspace to remove uninteresting detectors
                 CropWorkspace(InputWorkspace=ws,OutputWorkspace= ws,
                     StartWorkspaceIndex=self._detector_range_start,
                     EndWorkspaceIndex=self._detector_range_end)