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

[Uwe Ligges]

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
> 
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