Refs #9587 - Correct usage example.

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

@@ -71,7 +71,7 @@ value that should be excluded, then the entire bin is excluded. What
 this means in practice is that the edge bins will possibly have a
 reduced number of counts.
 
-Restrictions on the input workspace
+Restrictions on the Input Workspace
 ###################################
 
 The input workspace must contain histogram data where the X unit is
@@ -79,7 +79,7 @@ time-of-flight and the Y data is raw counts. The
 `instrument <instrument>`__ associated with the workspace must be fully
 defined because detector, source & sample position are needed.
 
-Child algorithms used
+Child Algorithms Used
 #####################
 
 If the input workspace contains more than a single spectrum, Unwrap
@@ -87,4 +87,40 @@ makes use of the `rebin <rebin>`__ algorithm to set the bins on the
 output workspace to common values which cover the maximum theoretically
 accessible wavelength range.
 
+Usage
+-----
+
+**Example - Unwrap Dummy Monitor**
+
+.. testcode:: ExUnwrap
+
+   # Create dummy workspace.
+   ws = CreateSimulationWorkspace(Instrument="IRIS", BinParams="0,500,2000", UnitX="TOF")
+
+   # Get the reference length.
+   instrument = ws.getInstrument()
+   sample = instrument.getSample()
+   source = instrument.getSource()
+   detector = ws.getDetector(0)
+   sample_to_source = sample.getPos() - source.getPos()
+   r = detector.getDistance(sample)
+   x = sample_to_source.getZ()
+   l_ref = x + r
+
+   unwrapped_ws, join = UnwrapMonitor(ws, LRef=l_ref)
+
+   print "The join wavelength was %d." % join
+   print "The length used for the reference flight path was %d." % l_ref
+   print "The first spectra did contain %s." % str(ws.readY(0))
+   print "The first spectra now contains %s." % str(unwrapped_ws.readY(0))
+
+Output:
+
+.. testoutput:: ExUnwrap
+
+   The join wavelength was 0.
+   The length used for the reference flight path was 37.
+   The first spectra did contain [ 1.  1.  1.  1.].
+   The first spectra now contains [ 1.33333333  1.33333333  0.33333333].
+
 .. categories::