Usage Example for ThresholdMD re #9726

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

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

@@ -12,4 +12,30 @@ Description
 Threshold an MDHistoWorkspace to overwrite values below or above the
 defined threshold.
 
+Usage
+-----
+
+**Example - Threshold a small workspace:**
+
+.. testcode:: ExThresholdMD
+
+   # Create input workspace
+   CreateMDWorkspace(Dimensions=3, Extents='-10,10,-10,10,-10,10', Names='A,B,C', Units='U,U,U', OutputWorkspace='demo')
+   FakeMDEventData(InputWorkspace='demo', PeakParams='32,0,0,0,1')
+   threshold_input = BinMD(InputWorkspace='demo', AlignedDim0='A,-2,2,4', AlignedDim1='B,-2,2,4', AlignedDim2='C,-2,2,4')
+
+   # Run the algorithm to set all values greater than 4 to zero
+   threshold_output = ThresholdMD(InputWorkspace='threshold_input', Condition='Greater Than', ReferenceValue=4)
+
+   # Print selection before and after
+   print "selected bins before threshold greater than 4",threshold_input.getSignalArray()[1,1]
+   print "same bins after threshold greater than 4",threshold_output.getSignalArray()[1,1]
+
+Output:
+
+.. testoutput:: ExThresholdMD
+
+   selected bins before threshold greater than 4 [ 0.  4.  5.  0.]
+   same bins after threshold greater than 4 [ 0.  4.  0.  0.]
+
 .. categories::