Refs #8760. Usage example for focussing routine

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

@@ -17,4 +17,29 @@ Description
 Performs a TOF to dSpacing conversion using calibrated pixel positions, focuses the values in dSpacing
 and then converts them back to TOF.
 
+**Example - Simple focussing of and EnginX data file:**
+
+.. testcode:: ExSimple
+
+   # Run the algorithm
+   ws = EnginXFocus(Run="ENGINX00213855.nxs",
+   			   		Bank=1)
+
+   # Should have one spectrum only
+   print "No. of spectra:", ws.getNumberHistograms()
+
+   # Print a few arbitrary bins where higher intensities are expected
+   fmt = "For TOF of {0:.3f} intensity is {1:.3f}"
+   for bin in [3169, 6037, 7124]:
+     print fmt.format(ws.readX(0)[bin], ws.readY(0)[bin])
+
+Output:
+
+.. testoutput:: ExSimple
+
+   No. of spectra: 1
+   For TOF of 20165.642 intensity is 7.436
+   For TOF of 33547.826 intensity is 9.388
+   For TOF of 38619.804 intensity is 17.397
+
 .. categories::