[Paraview] Defining new Variables

[Rinehart, Richard D. (GRC-VG00)[DB Consulting Group, Inc.]]

Greetings!
A relative newbie Paraview question[http://www.cfd-online.com/Forums/images/smilies/smile.gif]. In Ensight I use the calculator to define essentially a new variable, such as degrees F as computed from K. I've done that in Paraview but it doesn't seem to then be available to use. ?
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