[R] Undefined columns selected

Andrew Robinson A.Robinson at ms.unimelb.edu.au
Fri Apr 29 03:56:42 CEST 2011


it looks like some of the columns that you are selecting don't exist.

What is the output of str(arc) before you run the code below?


On Thu, Apr 28, 2011 at 04:49:41PM -0700, Jennifer Wessel wrote:
> 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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Andrew Robinson  
Program Manager, ACERA 
Department of Mathematics and Statistics            Tel: +61-3-8344-6410
University of Melbourne, VIC 3010 Australia               (prefer email)
http://www.ms.unimelb.edu.au/~andrewpr              Fax: +61-3-8344-4599

Forest Analytics with R (Springer, 2011) 
Introduction to Scientific Programming and Simulation using R (CRC, 2009): 

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