Refs #9568. AlphaCalc

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

@@ -10,10 +10,35 @@ Description
 -----------
 
 Returns the relative efficiency of the forward detector group compared
-to the backward detector group. If Alpha is larger than 1 more counts
+to the backward detector group. If ``Alpha`` is larger than 1 more counts
 has been collected in the forward group.
 
 This algorithm leave the input workspace unchanged. To group detectors
-in a workspace use :ref:`algm-GroupDetectors`.
+in a workspace use :ref:`algm-MuonGroupDetectors`.
+
+Usage
+-----
+
+.. include:: ../usagedata-note.txt
+
+**Example - Calculating Alpha of a MUSR run:**
+
+.. testcode:: ExMUSRAlpha
+
+   loaded = LoadMuonNexus('MUSR0015189.nxs', AutoGroup=True)
+
+   first_period = loaded[0].getItem(0)
+
+   alpha = AlphaCalc(first_period,
+                     FirstGoodValue=0.55,
+                     LastGoodValue=12.0)
+
+   print 'Alpha value of the first period: {:.3f}'.format(alpha)
+
+Output:
+
+.. testoutput:: ExMUSRAlpha
+
+   Alpha value of the first period: 1.339
 
 .. categories::