Usage Example for GeneralisedSecondDifference re #10052

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

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

@@ -16,4 +16,28 @@ Instruments and Methods 50, 309 (1967). Given a spectrum with value yi
 difference curve, smoothed by averaging each point in the interval
 [-m,+m], and applying this procedure z times.
 
+Usage
+-----
+
+**Example - Use on a single peak**
+
+.. testcode:: ExGeneralisedSecondDifferenceSimple
+
+   # Create Workspace with peak around x=15.0
+   ws = CreateSampleWorkspace(BankPixelWidth=1, Xmax=30, BinWidth=1)
+
+   # Apply algorithm. 
+   wsD = GeneralisedSecondDifference(ws,M=2,Z=2)
+
+   # Show values around the peak
+   print "%.2f, %.2f, %.2f, %.2f, %.2f" % (wsD.readY(0)[8], wsD.readY(0)[9], wsD.readY(0)[10], wsD.readY(0)[11], wsD.readY(0)[12])
+   print "Peak at", wsD.readX(0)[10]
+
+Output:
+
+.. testoutput:: ExGeneralisedSecondDifferenceSimple
+
+   -0.34, -7.21, -20.00, -7.21, -0.34
+   Peak at 15.0
+
 .. categories::