[R] Error in -class : invalid argument to unary operator

rwmccauley raymond at raymondmccauley.net
Tue Mar 16 02:08:17 CET 2010

I was having a similar problem, then found that a previous format statement
had changed the column with the dash in front of it to a string. I changed
the column back into floats, and the dash worked fine, no longer giving me a
unary operator error.
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