Re: [R] How to override coerion error in 'scan'

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Sat 23 Apr 2005 - 23:49:54 EST

Kittler, Richard wrote:

> I am using 'read.csv' in V2.0.1 to read in a CSV file with the
> colClasses option and am getting an error from 'scan' when it encounters
> a non-numeric value for a 'numeric' column, i.e.
>
> > ds <- read.csv(in_file, nrows=irow, row.names=NULL,
> colClasses=zclass,
> comment.char="")
> Error in scan(file = file, what = what, sep = sep, quote = quote, dec
> = dec, :
> "scan" expected a real, got "03/15/200523:56:03"
>
> Is there a way to override this and just have it convert those values to
> NA? The dataset is large so I would prefer not to have to import the
> columns as character and convert them to numeric afterward.

I think you have to read it in as character - or write your own C-level facility...

Uwe Ligges

>
> --Rich
>
> Richard Kittler
> AMD TDG
> 408-749-4099
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Apr 23 23:57:37 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:31:23 EST