R help - Jun 2013 - padding specific missing values with NA to allow cbind

Dear list

Getting very frustrated with this simple-looking problem
> m1 <- lm(x~y, data=mydata)
> outliers <- abs(stdres(m1))>2
> plot(x~y, data=mydata)
I would like to plot a simple x,y scatter plot with labels giving custom
information displayed for the outliers only, i.e. I would like to define a
column mydata$labels for the mydata dataframe so that the command
> text(mydata$y, mydata$x, labels=mydata$labels)
will label those rows where outliers[i] = TRUE with text but is otherwise blank

The first problem I have is that due to some NAs in mydata, nrows(outliers) <
nrows(mydata) and I'm getting in a tangle trying to pad the appropriate rows
of outliers

Thanks

Rob

Try adding the argument
   na.action = na.exclude
to your call to lm().  See help("na.exclude") for details.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org] On Behalf
> Of Rob Forsyth
> Sent: Monday, June 10, 2013 2:42 PM
> To: r-help at r-project.org
> Subject: [R] padding specific missing values with NA to allow cbind
> 
> Dear list
> 
> Getting very frustrated with this simple-looking problem
> 
> > m1 <- lm(x~y, data=mydata)
> > outliers <- abs(stdres(m1))>2
> > plot(x~y, data=mydata)
> 
> I would like to plot a simple x,y scatter plot with labels giving custom
information
> displayed for the outliers only, i.e. I would like to define a column
mydata$labels for the
> mydata dataframe so that the command
> 
> > text(mydata$y, mydata$x, labels=mydata$labels)
> 
> will label those rows where outliers[i] = TRUE with text but is otherwise
blank
> 
> The first problem I have is that due to some NAs in mydata, nrows(outliers)
<
> nrows(mydata) and I'm getting in a tangle trying to pad the appropriate
rows of outliers
> 
> Thanks
> 
> Rob
> 
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