title: How do I represent the special values for Double (Pos/Neg Infinity, NaN) in a DataView.RowFilter expression?
body: <p>I have a special row that contains the sum of the other rows. It always comes first in a sort but I need to be able to keep it in a RowFilter expression. The only column I have to indicate that this row is special is a column of doubles. Any of the special values for Double should work but I don't know how to test for them in the expression language. <code>Column = 'NaN'</code> did not work.</p>