[R] colClasses
Kerpel, John
John.Kerpel at infores.com
Wed Jun 21 22:09:56 CEST 2006
Peter:
Thanks - I'll try both approaches. The examples clear things up a bit.
John
-----Original Message-----
From: pd at pubhealth.ku.dk [mailto:pd at pubhealth.ku.dk] On Behalf Of Peter Dalgaard
Sent: Wednesday, June 21, 2006 3:04 PM
To: Kerpel, John
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] colClasses
"Kerpel, John" <John.Kerpel at infores.com> writes:
> Hi Folks!
>
>
>
> I'm reading in some data from a .csv file that has a date column.
>
>
>
> How do I use colClasses to get read.csv to recognize the date column?
> The documentation on this seems to be nil -
>
> And yes, I've read help and R Data Import/Export and can't figure out
> what the colClasses syntax is.
1. It may be easier just to read the date field as factor or character
and convert using as.Date afterwards. If a format is needed, this
is actually the only way.
2. colClasses is a character vector, possibly named, so
cls <- rep(NA,17)
cls[3] <- "Date"
read.csv(...., colClasses=cls, ....)
or
read.csv(...., colClasses=c(mydate="Date"), ....)
should work (assuming that the variable in question is called
"mydate" and is in the 3 of 17 columns). This is documented in
?read.csv.
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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