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+====== How can I find unused symbols in my GAMS model? ======
+Q: //I'd like to find unused symbols in my GAMS models, e.g. sets and parameters that are declared but never used: not assigned to or referenced.  I can look at the $onsymxref output but is there something that just tells me the unused symbols?//
+You can get that information from a symbol reference file. Add the command line option ''rf=text'', where ''text'' is the name of your reference file to your GAMS command line. All symbol references will be written to this file.
+If you use the GAMS IDE,  click on the line in your process window, which starts with
+''--- RefFile ..''
+and you will get the contents of the reference file (here ''trnsport.ref'') nicely organized. The last tab (unused) shows the unused symbols. A double click on of the entries will get you to the corresponding  position in the source file.
+{{gams:trnsport_ref.jpg|}}

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