[R] "Missing value representation in Excel before extraction to R with RODBC"

[Petr Pikal]

Hi

I believe it has something to do with the column identification 
decision. When R decides what is in a column it uses only some values 
from the beginning of a file.

I do not use RODBC as read.delim("clipboard", ...) is usually more 
convenient but probably there is a way how to tell RODBC what is in 
the column instead of let R decide from the top of the file.

But I may be completely mistaken.

HTH
Petr


On 6 Jan 2006 at 20:47, Fredrik Lundgren wrote:

From:           	"Fredrik Lundgren" <fredrik.bg.lundgren at bredband.net>
To:             	"R-help" <r-help at stat.math.ethz.ch>
Date sent:      	Fri, 6 Jan 2006 20:47:29 +0100
Subject:        	[R] "Missing value representation in Excel before extraction to R
	with RODBC"

> Dear list,
> 
> How should missing values be expressed in Excel before extraction to R
> via RODBC. I'm bewildered. Sometimes the representation with NA in
> Excel appears to work and shows up in R as <NA> but sometimes the use
> of NA in Excel changes the whole vector to NA's. Blank or nothing or
> NA as representation for missing values in Excel with dateformat gives
> NA's of the whole vector in R but with  general format in Excel gives
> blanks for missing values in R. How should I represent missing values
> in Excel?
> 
> 
> Best wishes and thanks for any help
> Fredrik Lundgren
> 
> ______________________________________________
> R-help at 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

Petr Pikal
petr.pikal at precheza.cz