[R] overlay points on plot

[Prof Brian Ripley]

Is v a data frame?  In that case you need v[[2]] and v[[3]], as v[2] is a 
data frame.

On Wed, 18 Feb 2004, femke wrote:

> 
> Dear R-help list,
> 
> I'm trying to overlay a number of data objects in a plot.  Following an earlier example on the list I've created an empty plot as follows
> 
> > xlim <- range(as.numeric(c("0","10000")))
> > ylim <- range(as.numeric(c("0","25")) )
> > plot(NA, xlim=xlim, ylim=ylim, xlab="distance", ylab="semivariance")
> 
> However when I try to plot something on it, I get the following error:
> 
> > points(v[2],v[3])
> Error in as.double.default(x) : (list) object cannot be coerced to double
> 
> A sample of my data looks like the following V[2]:
> 
>        gamma
> 1   0.040000
> 2   0.582500
> 3   1.574545
> 4   7.126500
> .....
> 
> and V[3]:
> 
>         dist
> 1   470.0426
> 2  1045.6365
> 3  1607.1936
> ....
> 
> 
> Does anyone have any idea how to fix this?  
> 
> Thanks very much,
> 
> femke
> 	[[alternative HTML version deleted]]
> 
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> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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