Re #9579. Usage examples for SmoothData

Code/Mantid/docs/source/algorithms/SmoothData-v1.rst

@@ -19,4 +19,34 @@ value in the spectrum will be smoothed by making it the average of the
 first 3 values, the next will use the first 4 and then the third and
 onwards will use the full 5 points in the averaging.
 
+Usage
+-----
+
+Example 1: use same NPoints for all spectra
+###########################################
+
+.. testcode::
+
+  # Create a workspace
+  ws = CreateSampleWorkspace()
+
+  # Smooth the spectra in ws NPoints = 3
+  smooth = SmoothData( ws, 3)
+
+
+Example 2: use different NPoints for groups of spectra
+######################################################
+
+.. testcode::
+
+  # Create a workspace
+  ws = CreateSampleWorkspace()
+  # Greate a grouping workspace to put detectors from banks
+  # bank1 and bank2 into two separate groups
+  gr = CreateGroupingWorkspace(ws,GroupNames='bank1,bank2')
+
+  # Smooth the spectra in ws: first group with NPoints = 3 and
+  # second group with NPoints = 5
+  smooth = SmoothData( ws, [3,5], GroupingWorkspace='gr')
+
 .. categories::