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--- loki:loki [2009/02/21 13:43] – decianm
+++ loki:loki [2009/07/25 14:23] – decianm
@@ Line 25: / Line 25: @@
 **Notes:**
   * Mind the two ''__''!
-  * The code on the right sido of the '':'' is just a LoKi particle functor, which can be found [[ https://twiki.cern.ch/twiki/bin/view/LHCb/LoKiParticleFunctions | here]]. Don't forget: It's Python, not C++ (e.g. there aren't any ''::'' for namespaces).
+  * The code on the right side of the '':'' is just a LoKi particle function, which can be found [[ https://twiki.cern.ch/twiki/bin/view/LHCb/LoKiParticleFunctions | here]]. Don't forget: It's Python, not C++ (e.g. there aren't any ''::'' for namespaces).
+===== Adding bool Variables =====
+If your particle function returns a bool value, you first have to convert it in order to store it in a tuple. This can be done with the ''switch''-function, e.g.,
+<code>
+myTuple.LoKiTool.Variables = {
+    "IsMuon" : "switch(ISMUON,1,0)",
+   }
+</code>
+which will return 1 if the ISMUON returns ''true'' and 0 otherwise.

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