[R] Undefined columns selected

From: Jennifer Wessel <jweezee_at_yahoo.com>
Date: Thu, 28 Apr 2011 16:49:41 -0700 (PDT)

This is part of my program. I am getting an error, that I cannot figure out, any help would very much appreciated, thanks.

 	# subset variables 
 	arc <- arc[,c("SNAP", "code",  "ncode", "var", "n_total")]
Error in `[.data.frame`(arc, , c("SNAP", "code", "ncode", :   undefined columns selected

         arc$N_eff <- with(arc, ifelse(var > 1, n_total, var * n_total)) Error in storage.mode(test) <- "logical" : object 'var' not found

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